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Meet The Faculty

The Department of Dermatology at Mayo Clinic's campus in Rochester, Minnesota, offers a full range of dermatologic care for both common and rare problems related to skin, hair, nails, and mucous membranes.

Mayo Clinic has more than 44,000 dermatology outpatient visits each year. The inpatient dermatology service at Mayo Clinic Hospital, Methodist Campus, cares for more than 400 patients annually. Some of these patients have unusual or complicated dermatologic problems and are referred by their physicians, but many are self-referred.

The department's 33 board-certified physicians are experts in medical, surgical, and pediatric dermatology. All have full-time appointments in the department.

In addition to caring for patients in their clinical practices, faculty members are committed to teaching and facilitating the growth of medical knowledge. Many faculty members have published and lectured extensively and are well-regarded in their specialized fields. Residents have direct access to faculty throughout the Dermatology Residency.

From the program director

Carilyn Wieland, M.D.

Thank you for taking the time to learn more about Mayo Clinic’s Dermatology Residency program in Rochester, Minnesota.

We pride ourselves on having a comprehensive and rigorous program that is also welcoming and inclusive and prioritizes our residents’ well-being. Our residents come from across the nation and the world, and upon graduation join a wide alumni network that puts into practice the Mayo Clinic motto: “the needs of the patient come first.”

In our program, we seek to create a collaborative environment that allows for optimal learning and top-notch patient care. We believe that learning directly from patient care is key to residency training and future independent practice – whether that be in the community, academics, or for further subspecialty training.

Our patient population spans from our community and region to across the nation and world. Therefore, our residents learn to provide culturally competent care for both common and complex dermatologic conditions in diverse patient populations. Residents also learn from renowned specialists in complex medical dermatology, pediatric dermatology, dermatologic surgery, aesthetic dermatology, and dermatopathology.

It’s an honor to serve as program director. I recognize that our program is excellent because of many committed individuals (education coordinators, allied health staff, residents, and esteemed faculty) as well as the many resources offered by Mayo Clinic and Mayo Clinic School of Graduate Medical Education. While it has been some time since I applied for residency, I’m forever grateful that I had the opportunity to train at Mayo Clinic in Rochester, Minnesota, and get to foster the next generation of Mayo-trained dermatologists.

If you’re looking for a supportive training environment that will allow you to become a knowledgeable, skilled, and compassionate dermatologist, then you’re looking in the right place! Welcome!

Carilyn (Carrie) Wieland, M.D. (she/her)
Dermatology Residency Program Director

Core faculty

Katelyn Anderson, M.D.

Katelyn Anderson, M.D. (she/her)

Dr. Katelyn Anderson is an assistant professor of dermatology and pediatrics at Mayo Clinic College of Medicine and a senior associate consultant in the Department of Dermatology. After attending medical school at the University of Iowa Carver College Of Medicine, she came to Mayo Clinic for pediatric residency and found herself here to stay! She went on to complete a dermatology residency and a pediatric dermatology fellowship at Mayo Clinic and was delighted to join the staff thereafter. Her clinical and research interests include vascular tumors and malformations, atopic dermatitis, and cutaneous diseases in pediatric organ transplant patients.


Dr. Anderson is a member of Mayo Clinic's Dermatology Education Committee and is enthusiastic about resident and medical student wellness, education, and mentorship. She has enjoyed partnering with the residents to organize the annual dermatology resident-staff fitness challenge! Outside of medicine, Dr. Anderson is a busy mother of three, and enjoys distance running, watching the newest Netflix series, and spending time with her husband and children.


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Hafsa Cantwell, M.D.

Hafsa Cantwell, M.D. (she/her)

Dr. Hafsa Cantwell (Huhf-sa) is one of our medical dermatology faculty. She grew up in the Boston area, then headed Midwest to attend medical school at Mayo Clinic School of Medicine in Rochester, Minnesota. In awe of the immense resources and the unique culture at Mayo Clinic, she decided to stay for the dermatology residency. She was thrilled to join the faculty after graduation! Dr. Cantwell especially enjoys her time on the hospital service. Her clinical interests include aesthetic dermatology, alopecia, hospital dermatology, and skin of color dermatology.


When not in clinic, she and her husband are busy parents to their twin boys and enjoy spending time outdoors, exercising, and exploring Minnesota's many excellent ice cream spots.


What do you enjoy about working with residents/fellows? Working with residents and fellows is a constant source of inspiration that pushes me to learn more within the field of dermatology. Our trainees ask excellent questions and share many clinical pearls. The teaching often goes both ways when I work with trainees!


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Mark Davis, M.D.

Mark Davis, M.D. (he/him)

Dr. Mark Davis is the Chair of the Department of Dermatology. He hails from Ireland where he graduated from the Royal College of Surgeons and then completed four years of training in internal medicine in Dublin. Mayo Clinic has a massive international name in Ireland, and wanting to get the best further training he could, he moved to Minnesota and completed an internal medicine residency at Mayo Clinic. He then decided on a career in dermatology and applied for and was accepted to the dermatology residency and additionally, the clinician investigator track with two years of training in research. In 1997, he joined the consultant staff at Mayo Clinic. The years have flown by!


Outside of work, Dr. Davis enjoys meeting colleagues at national and international meetings, traveling the world to see family and friends, CrossFit at 5 a.m. (when he can make it), skiing, music of all kinds, and theater (which is incidentally terrific in Minneapolis).


What's the best thing about our work? Working with great colleagues not only in dermatology but across disciplines is what inspires me daily. We see patients from every walk of life with conditions that vary from straightforward to complex and life-threatening. If you need help with any aspect of care or to get the opinions of colleagues, they are available. There are so many exciting things happening in the department to move our discipline forward, including engagement in AI, digital dermatopathology, new techniques in surgery, the Center for Aesthetic Medicine and Surgery, cross-disciplinary research, and exceptional education programs. All with a firm focus on the needs of the patient being central to everything we do.


What do you enjoy about working with residents/fellows? One of the very best things about my job is being able to interact with our amazing residents and fellows. They're an inspiration to all of us - they're talented and brilliant individuals, and it's so marvelous to witness their development between the first day of their training to their graduation as fully-fledged dermatologists and subspecialists. Along the way, they inspire us, challenge us, and add joy to our days.


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Addison Demer, M.D.

Addison Demer, M.D. (he/him)

Dr. Addison Demer is one of our Mohs surgeons and serves as the Associate Program Director for the Mohs (MSDO) Fellowship. He grew up in the Twin Cities where he trained at the University of Minnesota. Dr. Demer has research and clinical interests in special-site cutaneous melanoma, high-risk non-melanoma skin cancer, digital imaging/AI in dermatology, and reconstruction. His favorite part of life at Mayo is working closely with the residents and fellows, and teaching.


Outside of work, Dr. Demer can often be found on the Gamehaven mountain bike trails with his wife and three kids, “ripping it up” on his Onewheel, snowboarding, camping, boating at the cabin, or doing any number of active hobbies. When not on the go, you may find him with a burrito or Flapdoodle's ice cream cone in hand watching Netflix.


What do you enjoy about working with residents/fellows? I love the opportunity to both teach and learn from residents/fellows on a daily basis. I feel very grateful to work in such a tremendous academic environment with amazing colleagues.


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Julio Sartori-Valinotti, M.D.

Julio Sartori-Valinotti, M.D. (he/him)

Dr. Julio Sartori-Valinotti (Who-leo) is our Associate Program Director and an assistant professor of Dermatology and Medicine. He attended medical school in Asuncion, Paraguay, and completed a residency in internal medicine before moving to the U.S. After a postdoctoral fellowship at the University of Mississippi Medical Center, he joined Mayo Clinic for the internal medicine residency, followed by the dermatology residency and dermatopathology fellowship. Dr. Sartori-Valinotti is passionate about resident education and well-being. His clinical interests include complex medical dermatology, erythromelalgia, hospital dermatology, aesthetic dermatology, and teledermatology.


Outside of medicine, Dr. Sartori-Valinotti enjoys spending time at the gym, traveling, attending sports events with his family, watching superhero movies, and eating ice cream.


What do you enjoy about working with residents/fellows? I enjoy witnessing their professional and personal growth and development as future dermatologists. The enthusiasm and dedication they bring to their work are truly inspiring. Collaborating with them also allows me to stay up to date on the latest advancements in the field and fosters a dynamic and engaging learning environment for everyone.


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Megha Tollefson, M.D.

Megha Tollefson, M.D. (she/her)

Dr. Megha Tollefson is our past Residency Program Director and serves as past Pediatric Dermatology Fellowship Director. She grew up in a few places around the country but considers the Bay Area in California to be home (even though she has lived in Rochester longer!). She left the Bay Area to come to Mayo first for medical school, then for residencies in pediatrics and dermatology. She completed her pediatric dermatology fellowship back in California and then returned to Mayo to join the faculty as a pediatric dermatologist. She is committed to education and serves as a Senior Associate Dean in the Mayo Clinic School of Graduate Medical Education and as the Associate Dean of Admissions for Mayo Clinic Alix School of Medicine. In the clinical setting, you can often find Dr. Tollefson discussing all things pediatric dermatology, but especially complex vascular malformations patients. She is passionate about providing interdisciplinary care, furthering pediatric dermatology research, and all things education.


Outside of work, you can find her riding her indoor exercise bike (also popularly known as “the bike that goes nowhere”), traveling to new places with her family, or exploring the latest restaurants.


What do you enjoy about working with residents/fellows? There are too many things to love about working with residents and fellows! I love the teamwork aspect and being able to directly see and impact someone's growth as a physician. I also learn so much from them, and I find myself increasingly inspired to continue to learn and grow through that.


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Carilyn Wieland, M.D.

Carilyn Wieland, M.D. (she/her)

Dr. Carilyn Wieland (like ‘Carolyn’ but with an ‘I’, WEE-land) is our Program Director and also serves as the Dermatopathology Fellowship Program Director. She grew up in northwestern Illinois and attended medical school at the University of Chicago before coming to Mayo Clinic for the dermatology residency and dermatopathology fellowship. A summer research experience as an undergraduate introduced her to the amazing resources and culture at Mayo Clinic, and these opportunities and environment inspired her to return for residency. She has been on faculty ever since! Dr. Wieland especially enjoys discussing cases that require clinical and pathologic correlation with residents and promoting topics of equity and diversity in dermatology. Her clinical and academic interests include autoimmune blistering disease, alopecia, and digital pathology.


Outside of work, you might find her training for her next half marathon (or maybe even cross-country skiing in the winter), taking care of her chickens, or enjoying her favorite local Pho restaurant with her family.


What do you enjoy about working with residents/fellows? Residency and fellowship are such exciting times in one's career. I enjoy seeing the tremendous growth that occurs in residents and fellows over their training, and it's very satisfying to be able to support them during these fun and busy years. Their enthusiasm and energy keep me excited about being a lifelong learner!


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Saranya Wyles, M.D., Ph.D.

Saranya Wyles, M.D., Ph.D. (she/her)

Dr. Saranya Wyles (sa-REN-ya, Wyles rhymes with miles) is a dermatologist-scientist at Mayo Clinic's Department of Dermatology and Director of the Regenerative Dermatology and Skin Aging Laboratory. Dr. Wyles grew up in India and New York. She attended Barnard College, Columbia University, then pursued a research fellowship at the Harvard Stem Cell Institute. She came to Mayo Clinic in Rochester, Minnesota, for the M.D./Ph.D. program and continued training in the dermatology residency. Dr. Wyles was inspired by the patient-first philosophy at Mayo Clinic. As the Directory of the Skin and Aging Laboratory, her research focuses on 3-D bioprinting, regenerative biotherapeutics, and cellular hallmarks of skin aging. She also serves as the Research Chair at Mayo Clinic Center for Aesthetic Medicine and Surgery.


Check out her work on Instagram @DrWyles.Derm! Outside of work, she enjoys spending time with her family and being a mom to her spirited, young daughter.


What do you enjoy about working with residents/fellows? I enjoy teaching cosmetic dermatology, especially engaging residents and fellows in hands-on aesthetic procedures.  


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Molly Youssef, M.D.

Molly Youssef, M.D. (she/her)

Dr. Molly Youssef is a medical dermatologist who also has training in pediatric dermatology. She grew up on a farm in southeastern Minnesota and attended medical school at the University of Minnesota. She completed the pediatric residency at Mayo Clinic and during that time, she discovered a passion for dermatology. She subsequently completed the dermatology residency at the Medical College of Wisconsin and Mayo Clinic, followed by the pediatric dermatology fellowship. Her clinical and academic interests include allergic contact dermatitis, atopic dermatitis, oral dermatology, hyperhidrosis, and pediatric skin conditions. She greatly enjoys teaching (and learning from!) the dermatology residents.


Outside of work, she enjoys spending time with her husband and two young boys, watching sporting events, running, and going to concerts. 


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Advisers and mentors

Department of Dermatology faculty members generally have an open-door policy. Daily interaction between staff and residents is encouraged. Upon graduation, most residents are able to name several staff members who strongly influenced their development and career choice.

To establish a framework for group mentoring and formalize the ongoing evaluation, however, each resident is assigned a faculty adviser upon entering the program. Advisers supply educational advice and personal support throughout the residency. Advisers also introduce residents and their families to Mayo Clinic and the city of Rochester.

Residents meet with their faculty advisers two to three times each year to assess progress, review feedback, set goals, and discuss research pursuits. Faculty advisers award residents their diplomas during the graduation ceremony. For some residents, the relationships established with faculty advisers continue throughout their careers.

Visiting professors

Many prominent professors visit Mayo Clinic each year. They present their work during lectures and participate in hospital rounds. Residents are encouraged to take full advantage of these opportunities.