Meet Our Residents

Page Content

Emergency Medicine chief residents — 2025-2026 Chief Residents

From the chief residents

Welcome to Mayo Clinic’s Emergency Medicine Residency!

As chief residents, we’re excited to share why we love training in Rochester, Minnesota. At Mayo Clinic, the needs of the patient always come first, and a spirit of collegiality and camaraderie makes coming to work a joy.

Our residents manage an incredible breadth of pathology, from the “bread and butter” of emergency medicine to highly complex cases. We run all ED airways, share trauma leadership with surgery, and benefit from three cadaver-based labs each year on airway management, critical procedures, and extremity injuries.

Our program provides support for nearly any activity that will help you reach your goals as an educator, community physician, or researcher. Our residents hold national and regional leadership positions within ACEP, EMRA, and ABEM. Funding for research and travel to present at conferences is widely available through both departmental and institutional grants. Each year, our interns have the chance to go to a national conference for learning and bonding together. Elective time allows residents to tailor training, with options at places like Shock Trauma, Phoenix Children’s Hospital, and the Tuba City Navajo Reservation.

As a four-year program, we offer distinct tracks in education, research, leadership, community practice, and subspecialty fellowships. Graduates have gone on to launch residencies, pursue aerospace, hyperbaric, data science, and EMS fellowships, join community practices, and teach at academic institutions. Each resident is paired early with a mentor to guide career development.

Most importantly, our program feels like family. Our faculty and staff know us as individuals and actively support our goals. Diversity and wellness are priorities, with institutional support for parenting, paid family leave, and lactation spaces. Outside the hospital, residents enjoy game nights, outdoor activities, and a welcoming Rochester community.

Mayo’s three shields of patient care, education, and research reflect our training experience and legacy. We look forward to meeting you, learning about your goals, and sharing what makes Mayo Clinic such a special place to train!

Lemuel Hackshaw, M.D., Tim Shen, M.D., Kate Skeens, M.D.
2025-2026 Emergency Medicine Residency Chief Residents

Our residents

Our residents come from medical schools around the U.S. and outside the country. Learn more about them and what they have to say about our program.

Class of 2026
Class of 2027
Class of 2029

Class of 2026

	Nicole M. Entenmann, D.O. Hometown: Sartell, MN Medical school: A.T. Still University-Kirksville, MO Hobbies: Rollerblading, soccer, hiking, being active outdoors with my dog, Willow, working out, spending time with family and friends, gardening and canning, traveling, and finding the best breakfast food in town Why Mayo: When I started working as an EMT Paramedic at Gold Cross Ambulance, now Mayo Clinic Ambulance, I had a long-standing dream to come back to Mayo Clinic as a physician, full circle. I wanted the chance to grow, become the best physician I could be, and learn beside great EM leaders. In my fourth year of medical school, I rotated at Mayo Clinic and learned the physicians put patient care, shared decision-making, and empathy above all and teaches its residents and staff to do the same. I also love that the program offers a variety of electives and opportunities to help me explore my interests. I am happy to be back in Minnesota to finish out my training and spend time with my family and friends.
	Lemuel Gordon-Hackshaw, M.D. Hometown: Jamaica Queens, NY Medical school: University of Connecticut School of Medicine Hobbies: Doing anything at all with my wife, kicking back with friends and family, weightlifting, and Christmas Why Mayo: The people. I did my away rotation here and have never worked with a set of attendings who were so kind and so dedicated to education. Mayo also has a dedication to wellness, and it shows. I wanted a program that would not only challenge and train me well but would also give me unlimited professional and leadership opportunities, lifelong friends, and a good work-life balance. Mayo is that place for me, and it did not take long for Mayo to feel like home.
	Sarah Hopfer, M.D. Hometown: Family is in the Scranton area, PA Medical school: Indiana University School of Medicine Hobbies: Natural history, exploring the world around me, hiking, watching the weather, gymnastics, and philosophy Why Mayo: Mayo Clinic is built on the ideas of patient-centered medicine and radical curiosity, and it provides the opportunity for residents to learn the different aspects of their trade from experts in their fields.
	Carrie Johnson, M.D., Ph.D. Hometown: Montevideo, MN Medical school: Cleveland Clinic Lerner College of Medicine Graduate school: University of Michigan Hobbies: Tennis, hockey, basketball, softball, swimming, cycling, watching college football (Go Blue!), spending time at the lake, cooking, baking, eating, naps Professional interests: Critical care, sports medicine, rural medicine, medical education, healthcare advocacy policy and leadership Why Mayo: I never had the chance to rotate here, but I knew the reputation of Mayo Clinic. When I interviewed, it was clear the people were of excellent clinical knowledge and character. I wanted to be at a place that saw me as more than just labor but as a trainee and colleague worth investing in and educating. Mayo invests its resources in teaching and training us. The opportunity to have ample elective time in a three-year residency, and to do it anywhere in the country and the world, is an example of that. The first orientation month, with multiple robust hands-on training sessions, are further examples. The faculty and support staff care about our training and do so in a constructive manner. The opportunity to do rotations at the main campus in Rochester (with longitudinal pediatrics), at Mayo Clinic in Arizona and Jacksonville, and at rural community sites, offered the opportunity to get the breadth of EM training I was seeking to be able to robustly care for patients in all settings and with all types of pathology.
	Brian Obritsch, D.O. Hometown: Bismarck, ND Medical school: Idaho College of Osteopathic Medicine Hobbies: Snowboarding, backcountry backpacking, big game hunting, mountain biking, playing guitar, reading, taking my golden retriever Kona for walks, woodworking, and traveling Why Mayo: There is a reason Mayo Clinic is consistently ranked as one of the best hospitals in the world as everything they do is focused on "putting the needs of the patient first." This culture of excellence really resonated with me and is something I strive to keep at the forefront of each patient encounter. I appreciate the ability to become well-rounded and train in both an academic ED setting with its resources, education, and availability of on-call consultants as well as the community ED setting practicing with limited amenities. This academic community model provides exposure to a full spectrum of cases from the occasional zebras, to challenging traumas to the sick bread-and-butter patients with everything in between. Overall, I believe this program would offer me the training to become the best EM doctor I can be!
	Tim Shen, M.D. Hometown: San Diego, CA Medical school: University of Chicago, Pritzker School of Medicine Hobbies: Soccer, Basketball, pickleball, cooking, and dabbling in sewing Why Mayo: From a systems perspective, Mayo is the smoothest running hospital I have seen. Two things follow from this: the needs of the patient are truly prioritized, and residents are able to focus all their energy on learning excellent clinical medicine. As an emergency medicine resident, I also have the opportunity to learn from and work with some of the most knowledgeable individuals in the world from each specialty.
	Kate Skeens, M.D. Hometown: Owensboro, KY Medical school: University of Louisville School of Medicine Hobbies: Photography, walking my dog, and enjoying the beach Why Mayo: Mayo Clinic stood out as a program that prepared residents to enter clinical practice anywhere by offering multiple training sites and opportunities. I wanted a training program that emphasized the importance of patient care and valued the patient's experience.
	Olivia Stanier, M.D., M.S. Hometown: Toronto, Canada Medical school: Loma Linda University School of Medicine Hobbies: Exploring nature, weightlifting, hanging out with my cat, relaxing with friends, and playing piano Why Mayo: The residents and faculty have created a fantastic culture to help learners succeed. There are top-notch educational opportunities from consultants who are experts in their field and there is a diverse amount of pathology to learn from. Rochester itself is beautifully quaint; with lots of parks and a river passing through, there's always something to do outside.
	Austin Walker, M.D. Hometown: Pacifica, CA Medical school: University of California San Francisco Hobbies: Meditation, gaming, biking, drumming, and backpacking Why Mayo: Low-ego high-performance medicine. Down-to-earth people who foster a fantastic environment for training. Abundant support for any professional interests. Alumni have gone on to practice in almost every setting and unanimously endorse feeling well-equipped to do so.

Class of 2027

	Kylea Barnes, M.D. Hometown: Maple Grove, MN Medical school: Chicago Medical School at Rosalind Franklin University Hobbies: Reading (mostly fantasy and thrillers), baking, plants, working out, scuba diving Why Mayo: I wanted to find a place that I would not only learn a lot and have a high volume of patients, but also where I would feel like I was a part of a tight knit community and actually wanted to be friends with my co-residents outside of work. Mayo IS the perfect blend of all of that. There is no question that Mayo has the best of the best to learn from. Bread and butter, trauma, super medically complex patients? Mayo has it all and a lot of it. From my interview day I knew the people here care about each other and exude an environment that is fun, non-judgmental, and supportive.
	Rosanna Chorro Bas, M.D. Hometown: Xàbia, Alicante, Spain Medical school: Universitat de Valencia Hobbies: Animal rescue, developing medical simulators with my husband and brother, running, CrossFit, and home remodeling. Why Mayo: I chose Mayo Clinic for its excellence in education and collaborative culture. The infrastructure and resources available here are unparalleled, offering access to state-of-the-art technology and a wide variety of complex clinical cases, providing exceptional learning opportunities. Additionally, the opportunity to engage in innovative research projects and collaborate with leaders in the field was a significant motivation for me. The personalized attention to both professional and personal development has made Mayo Clinic feel like a second family to me.
	Byrne Curl, M.D. Hometown: Bismarck, ND Medical school: University of North Dakota Hobbies: Hockey, golf, road/mountain biking, camping, hunting/fishing, really anything outside! Why Mayo: I did a visiting rotation here as a medical student and really loved the people and the work environment. I felt that I would get great training and be well prepared for my future endeavors in medicine.
	Rebecca Falzon, M.D. Hometown: Plymouth, MI Medical school: Central Michigan University Hobbies: Traveling, exploring new cuisines, enjoying the outdoors (skiing, camping, hiking), playing the violin, spending time with my family and friends Why Mayo: The faculty and support staff at Mayo are exceptional people who care about resident education and well-being. The curriculum focuses on fostering well-rounded clinicians who are skilled and prepared to work in any clinical environment.
	Amanda Holm, M.D. Hometown: Pipestone, MN Medical school: University of Minnesota Medical School Hobbies: Hiking, kayaking, camping, running, leatherworking, anything I can do outdoors with my family and dog Why Mayo: Having grown up in rural Minnesota, Mayo Clinic was the place to go for the best care. While interviewing with Mayo, I found that this excellence extended into the emergency medicine residency as well. All of the residents were very knowledgeable, but more importantly, they all seemed genuinely happy. Mayo provides us the support to become competent emergency providers in a variety of settings, while also supporting our wellness and work-life balance. As someone who plans to return to a rural emergency department, the opportunity to work at the rural health system sites are also invaluable learning opportunities to understand care at single coverage, low resource emergency rooms.
	Obadi Obadi, M.D. Hometown: Addis Ababa, Ethiopia and Atlanta, GA Medical school: Medical College of Georgia Hobbies: I enjoy traveling and exploring new countries, cultures, and cuisines (ask me about my most recent travel adventures the next time you see me). I also enjoy watching Judge Judy (Judy Justice)! Why Mayo: Mayo Clinic is world-renowned for a reason, and the reasons became clear to me during my interview. Everyone at Mayo is deeply committed to the institution's vision and mission, which is evident not only in their treatment of patients but also in their interactions with each other. The motto "The needs of the patient come first" is not just a slogan on the website. It truly manifests in the day-to-day operations of the Mayo Clinic. It is no surprise that patients travel from all over the world to receive treatment here, which is particularly interesting to me as someone passionate about international medicine. The cherry on top was that everyone I met during my interview was genuinely nice and happy!
	Sam Sayed, M.D. Hometown: Arlington, TX Medical school: Burnett School of Medicine TCU Hobbies: Basketball, billiards, golf and spending time with my daughter, Sophie. Why Mayo: I chose to do my residency at Mayo Clinic because of its reputation for excellence and innovation in patient care. The institution's emphasis on a high-performance, low-ego, and collaborative environment aligns perfectly with my professional values and aspirations. At Mayo, I can learn from world-class experts who prioritize teamwork and humility, ensuring the best outcomes for patients through a truly integrated and supportive approach.
	Meaghan Sievers, M.D. Hometown: Gary, SD Medical school: University of South Dakota Hobbies: Spending time with family and friends and it's bonus points if it's at home on the lake! Taking care of my plant babies, anything outside in the sun (pretty sure I'm solar charged just like my plants), live music, skiing, watching NCAA gymnastics, celebrating anything and everything-especially my people, birthdays and Christmas Why Mayo: Mayo was a household name for me growing up with several loved ones receiving their own medical care here. On the other end of things, I was able to see how Mayo not only gave patients and their families hope but did so with such compassion and heart which is ultimately what made all the difference. I knew that I wanted to be a part of that- to be able to have an impact like that. Having the opportunity to train here and learn from world-class physicians and educators is an incredible honor, and I am so looking forward to taking all that I learn here to benefit my future patients. Beyond that, Mayo has truly unlimited opportunities available to you as a trainee, and I am so excited to take advantage of as many of these opportunities as I can!
	Lisa Viltz, M.D. Hometown: San Diego, CA Medical school: University of Colorado School of Medicine Hobbies: Rock climbing, travel, skiing, exercise, reading, baking, and most importantly, spending time with my partner, our dog, and our two cats. Why Mayo: When my mom was in college, she worked for a physician who trained at Mayo. I grew up hearing stories about how incredible Mayo Clinic is, and how it's at the forefront of medicine and research. Over the years, I've had family members, friends, and colleagues who have gone to Mayo in their times of need and had phenomenal experiences as patients at Mayo. I feel extremely lucky to have the opportunity to train at a hospital that has had such a positive impact on countless lives, and I truly believe I'll receive the best training in the country here.

Class of 2029

	Adebisi Adeyeye, M.B.B.S Hometown: Lagos, Nigeria Medical school: University of Lagos, Nigeria Hobbies: TV and film, game shows with a play of strategy, dance, holiday with friends and family Professional interests: Global health, disaster medicine, medical education, resuscitation science, clinical research Why Mayo: I chose to pursue emergency medicine training in the U.S. largely because of the disparities I witnessed during my medical training and practice back home. I was determined to find a program that not only supported my interests and long-term goal of advancing emergency care in Africa, but was also genuinely committed to helping me achieve them. During my interview at Mayo Clinic, I knew I had found that place. Hearing the program leadership speak with pride about their past trainees and their aspirations, including those from IMG backgrounds, was incredibly heartwarming. At Mayo Clinic, I know I will be trained to care for patients with excellence, humility, and compassion. And just as importantly, I get to do that alongside an incredible team of faculty, residents, and staff who make every day a privilege.
	Paul Amstutz, M.D. Hometown: Wichita, KS Medical School: University of Kansas School of Medicine Hobbies: Anything outdoors, woodworking, running, evening walks with my wife Professional interests: Global Health, Sepsis/Infectious Diseases, Pre-hospital Medicine, Medical Education Why Mayo: I can't imagine a better place to train! Respect for patients, humble curiosity, and clinical excellence are not just apart of Mayo's mission but are practiced by everyone who works here. During the interview season, I realized that the physician I wanted to be was embodied by the faculty and residents at Mayo Clinic.
	Rachel Bright, M.D. Hometown: Bixby, Oklahoma Medical school: University of Oklahoma School of Community Medicine Hobbies: Hanging out with people I love, working out and playing sports (lifting, yoga, running, jiu-jitsu, volleyball... you name it), horseback riding, taking my rescue dog Lulu anywhere, doing anything outside, reading, learning new languages, and whatever temporary obsession I have (sourdough is slowly fading away, maybe I'll pick up gardening?) Why Mayo: Hopefully I'm not the last bio so this isn't a super basic answer, but you guessed it... the people! Everyone here is unbelievably kind, and I knew that I would form great friendships, mentoring relationships, and be cared about as a person. Also, there's an opportunity to learn about the newest and best-of-the-best medicine, and I wanted to be a part of that.
	Kalyn Compton, M.D. Hometown: Wichita, Kansas Medical school: University of Kansas School of Medicine Hobbies: Exercise, reading (fantasy & romance), working around the house, putting healthy twists on meals and treats, educational podcasts, anything on a lake Why Mayo: I had long heard great things about Mayo Clinic, and from my first interactions with the EM team, I saw why. Here, “the needs of the patient come first” isn’t just a motto—it’s a guiding principle. I was struck by the humility and warmth of the people I met and knew this was a place where I’d be challenged and supported to grow both professionally and personally. I was also drawn to the promise of strong clinical training—shaped by a dynamic curriculum, robust institutional resources, and faculty whose expertise and leadership in the field are matched by their investment in resident development. The alignment between Mayo’s values and my own—particularly its emphasis on clinical excellence and humanistic care—made it the ideal place for my training and I’m honored to be part of this program.
	Amanda Hill, M.D. Hometown: Lino Lakes, MN Medical school: University of North Dakota Hobbies: Soup season, fantasy football, hiking, orange cats, collecting brewery stickers, weightlifting, scheming up travel plans and hoping my husband approves them Why Mayo: It was clear to me as a rotating medical student that the staff at Mayo are dedicated to helping you achieve your personal and professional goals. There is a unique variety of resources available here that will allow you to get an individualized residency experience, you can truly make it your own. Mayo is the best in the world for a reason- It is so exciting to get to learn from the very best in emergency medicine!
	Calvin Kienbacher, M.D. Hometown: Vienna, Austria (Europe) Medical school: Medical University of Vienna Hobbies: being outdoors with the dog, BBQ Why Mayo: I highly appreciate the commitment of all Mayo employees to provide excellent care for our patients together as a team. Mayo offers its residents unique training perspectives in a world-renowned program. These opportunities include my area of focus, emergency medical services.
	Gideon Poku, M.B., Ch.B. Hometown: Dormaa Ahenkro, Ghana Medical school: Kwame Nkrumah University of Science and Technology, Ghana. Hobbies: Watching and playing sports (mostly soccer and NFL), long road trips with my wife, playing chess seasonally and whatever activity involves spending time with friends and family. Professional interests: Global health, critical care Why Mayo? Mayo was my first in-person interview, and it immediately felt personal. Shadowing in the ED with a resource resident, I saw firsthand the patient- centered teamwork, coordination, and the high-functioning, low-ego culture everyone talks about. What truly stood out was the consistent message: Mayo supports your goals, whatever they are. One thing I heard time and again was to make your aspirations known, and Mayo has the resources and network to help bring them to life. Now that I’m here, I couldn’t imagine being anywhere else. Mayo continually surprises me in the best ways and I feel incredibly fortunate to be here. The support, resources, teamwork, and safety culture are exceptional. Every day reaffirms that I made the right choice. So why Mayo? Why not Mayo?
	Miguel Renteria, M.D. Hometown: El Paso, TX Medical school: Texas Tech University HSC Foster School of Medicine Hobbies: I love staying active and picking up new hobbies that keep life interesting — whether that’s flying planes, training for a triathlon, or learning a random skill just because it sounds fun. I spend a lot of time outdoors and rarely say no to a hike, run, or pick-up game, especially when it’s with good people. I also love to travel and experience new cultures, food, and perspectives. Professional interests: Aerospace medicine, global health, ultrasound and undersea and Hyperbaric Medicine Why Mayo: Mayo stood out to me from the start, not just because of its global reputation, but because of its deep commitment to excellence without ego. The collaborative, patient-centered culture aligns with how I want to practice medicine. I was especially drawn to the way residents are empowered here, with world-class resources, hands-on procedural training, and leadership development built in. Mayo isn't just a place to train, it’s a place to launch big ideas, work alongside people who inspire you, and an opportunity to become part of something bigger than yourself.
	Samantha Simpson, M.D. Hometown: Argyle, Texas Medical school: Medical college of Wisconsin Hobbies: I love anything crafty or nerdy! I like to crochet and embroider and I’m a pretty big reader (ask me for book recommendations). I am a HUGE dungeons and dragons fan and have run my own game for almost 8 years now. I also try to grow a garden every year and end up in a one way war with the local squirrels (next year I have a game plan though!). Professional interests: Pediatrics, advocacy, street medicine Why Mayo: I could go on and on, honestly! I loved being here from the very first minute I arrived on my interview day and I truly believe there is no other place in the world that is as supportive, as innovative, and as focused on constantly improving as Mayo is. We have what feels like endless opportunities here to learn, and do it all while focusing on the patient – there's a reason it's the number one hospital system in the world!