Meet the providers under our roof!

Primary Care Providers

Physician Assistant

Shannon Burns, PA-C

Shannon Burns joined TCHC as a Physician Assistant in 2018. She did her undergraduate degree work in Athletic Training at Castleton University, and then worked at Saint Michael’s College working with the Varsity sports teams as an Athletic Trainer. She attended Franklin Pierce University for her Masters in Physician Assistant Studies and graduated in 2018. Shannon provides Primary Care to patients of all ages, with a special interest in Orthopedics and Sports Medicine from her background in Athletic Training.


Pam Dawson, MD

Dr. Dawson grew up in Virginia and attended the College of William and Mary. She later traveled north to attend McGill University for Medical School and completed her Family Medicine Residency there in 1998. She joined Thomas Chittenden in 1999 and lives in nearby Richmond with her husband Steve and their two children Lauren and Will.

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Dan Donnelly, MD

Dan Donnelly’s great-great grandfather was a representative from the Benson, Vermont area, who in about 1870, was one of the first in the country to vote in favor of the right of women to vote. He was out-voted 220 to 1. Dan graduated from Kent State University in 1971, and several years later, from the University of Colorado, with a degree in nursing. After working for 5 years as a nurse, mostly in the Emergency Department at Maine Medical Center in Portland, he went to the University of Vermont College of Medicine. After a residency in Family Medicine at the University of Rochester (NY), he spent 3 years in an underserved area of Maine. He and his wife Nancy, and son Harley, moved back to Vermont after that, and have no plans to move again.

Physician Assistant

Rick Dooley, PA-C

Rick grew up in Vermont, graduated from the University of Vermont, and completed the Northeastern University Physician Assistant Program in 1996.

After working for several years at the Rural Health Clinic in Enosburg Falls, he joined Thomas Chittenden as a Physician Assistant in 1999. He enjoys providing comprehensive care to patients of all ages, with an emphasis on preventative care. He is on the teaching faculty for precepting Physician Assistant students from both the Massachusetts College of Pharmacy and Health Sciences and the University of New England. He also works as the Clinical Network Director for HealthFirst, representing independent medical practices across Vermont.

In his spare time, Rick enjoys music, hiking, biking, and any other activity that lets him enjoy the Vermont great outdoors.


Jeff Haddock, MD

Dr. Haddock was born and raised in the Chittenden county area. He went to Duke University in North Carolina for undergraduate school, where he got his B.S. in biology. After returning to the University of Vermont for medical school, he went to the Methodist Family Practice Program in Sacramento, California for his residency training. Fleeing California as quickly as possible, he has been practicing at Thomas Chittenden Health Center since 2006. He is married, with 2 sons and an intrepid weiner dog, Kona. He has particular interest in sports medicine and cheese.


Joe Haddock, MD

Dr. Joe Haddock grew up in rural western Illinois, attended undergraduate and medical school at Northwestern University, did his postgraduate training at the Medical Center Hospital of Vermont, and spent 3 years in the military at Camp LeJeune, N.C. Since 1978 he has practiced family and internal medicine at TCHC, and has been involved in various capacities with UVM, UVMMC, and medical payment reform efforts in the state. Outside interests include raising sheep, guitar, woodworking, and grandchildren.

While Dr. Joe has retired from actively seeing patients, he continues to be an integral part of TCHC as Medical Director.


Adrienne Jarvis, MD

Dr. Jarvis grew up in Burlington, Vermont. She received both her BA in art history and her MD from the University of Vermont, and completed the Family Medicine Residency Program at UVM Medical Center in 2021. Prior to medical school, she worked locally at various times as a labor and delivery assistant, a baker, a video store manager, and a clinical research assistant for Dengue Fever and West Nile Virus vaccine studies.

She lives in Burlington with her husband and daughter. Adrienne is very excited to join the providers at Thomas Chittenden and is passionate about providing primary care to patients of all ages.

Physician Assistant

Michele Leduc, PA-C

Michele is from Vermont and grateful to practice in such a wonderful community. She completed her Bachelors of Science degree at the University of Vermont, studying biological sciences and nutrition. She later completed the University of New England Physician Assistant program in Portland and Biddeford Maine, with a Masters of Science. Prior to joining TCHC she worked at UVMMC Emergency Department and UVM Primary Care Clinic.

She enjoys working with patients on health promotion and disease prevention, in addition to management of chronic conditions.

She enjoys spending time with her husband and 2 boys, hiking, gardening, backcountry skiing, kayaking, and being outdoors.

Zac Nollet

Physician Assistant

Zac Nollet, PA-C

Zac Nollet grew up in Massachusetts and Connecticut before studying Human Development at Cornell University (2009 – 2013) and subsequently moving to Vermont. He earned his Masters of Medical Science (MMSc.) through the Physician Assistant program at Tufts University School of Medicine in Boston, Massachusetts in January 2020. He is especially interested in Family Medicine.

He loves the Vermont outdoors, and enjoys hiking/biking/swimming/kayaking in his free time.

Family Nurse Practitioner

Mirsada Nurkanovic, DNP, FNP-C

Mirsada Nurkanovic finished nursing school in Bosnia and Herzegovina in May of 1993. In 2002 she joined her husband in Vermont. They live in Jericho with their two kids and enjoy spending time in the community. She completed her undergraduate studies at Johnson State College in 2014 and immediately after that started the Doctor of Nursing Practice APRN program at UVM. Upon graduation in 2018 she joined Thomas Chittenden Health Center as a Family Nurse Practitioner.

In addition to providing primary care to her patients, she is focused on health promotion/disease management and on improving telehealth services in this clinic. Mirsada provides services in both English and Bosnian.


David Simcoe, DO

David attended Purdue University in Indiana where he graduated in 1995 with a bachelor’s degree in molecular biology. He went to medical school at LECOM in Pennsylvania. He graduated with his medical degree in 1999. In 2002 he completed his residency training in family medicine in Chicago, Il. He worked in Indiana from 2002 until 2008. He then moved to Vermont and has been practicing medicine here since.

His interests include reading, music, philosophy, dogs, and Brazilian Jiu-Jitsu.

Family Nurse Practitioner

Lily Stolberg, FNP

Lily grew up in Hinesburg, VT and is so happy to be back in her home community practicing as a nurse practitioner. Lily graduated from UVM with a Bachelors in Psychology prior to completing her degree in nursing at Johns Hopkins University. After practicing as a nurse for 6 years, she completed her degree at Chamberlain University as a Family Nurse Practitioner.

She enjoys working with patients all across the lifespan and is dedicated to health promotion and disease prevention.

In her spare time, she loves spending time with her family and friends, being outside, and being active.


Adriane Trout, MD

Dr. Adriane Trout returned home to Vermont to join Thomas Chittenden in May 2013. After completing medical school at the University of Vermont in 2003, she went to Rochester, NY where she trained at University of Rochester’s Family Medicine Residency program. Her first three years after residency were spent practicing at a federally qualified inner city health clinic in Rochester. She was then employed at a hospital practice outside the city for another three years before happily relocating to Vermont with her husband and daughter.

In her free time, she enjoys spending as much time as possible outside with her family, reading and cooking made-up recipes.

Family Nurse Practitioner

Jack Visco, FNP

Born and raised in small-town Interior Alaska, Jack came to Vermont in 2012, seeking education in a setting similar to the wilderness of his home. Jack graduated from UVM with a Master’s of Science in Nursing and became a family nurse practitioner in 2015. A jack-of-all-trades by name and nature, Jack enjoys cycling, gardening, writing, and tending to the beehives in his backyard. He has worked as a countertop fitter, a popcorn popper, a tour guide in Denali National Park, an outdoor educator for young children, and a nurse for older adults. Jack lives in Burlington with his wife – also a nurse practitioner – and their two young children.

Jack has spent four years practicing at a busy internal medicine clinic in Franklin County prior to joining Thomas Chittenden in 2020. His top priority in the exam room is patient education. He strives to ensure that patients understand how to prevent disease, how to master their chronic conditions, and how to live well despite illness. Jack comes to TCHC in hopes of building close relationships with his colleagues, and to build upon his family practice, working with patients of all ages. His professional interests include nutrition and lifestyle medicine, fitness, addiction, and adolescent health.

Other Clinical Staff

Registered Dietitian Nutritionist/Certified Diabetic Educator

Mary Anne Kyburz-Ladue, RD, CDE, CE

Mary Anne completed her Bachelor of Science degree in Nutrition and Dietetics from the University of Vermont, followed by a Dietetic Internship in Clinical Dietetics and post graduate studies at Oregon Health Services University in Portland, Oregon. She returned to Vermont in 1988 with her husband to work as a Registered Dietitian at Burlington Primary Care. At this time, she also worked at Middlebury College on the Eating Disorders Treatment Team, counseling athletes and training coaches. In 1993 MaryAnne became a Certified Diabetes Educator by the American Academy of Diabetes Educators.

Mary Anne feels fortunate to work with patients of all ages to help improve their health and nutritional status, as they manage their diabetes, blood lipids, blood pressure, weight issues, and overall eating challenges.

Mary Anne grew up in Chile. She lives in Vermont with her family, and is passionate about the outdoors, either skiing, hiking, gardening or biking.

Advanced Practice Psychiatric Nurse

Nina Gaby, APRN-PMH

Nina Gaby is an Advanced Practice Psychiatric Nurse with 35 years of experience in almost all levels of psychiatric care including addictions. She did her training at the University of Rochester and has taught in several university systems as well as for the Vermont Department of Health.

Nina is also a writer and a visual artist with her work represented in several important collections including the Renwick Gallery of the Smithsonian. Nina joined the team at TCHC in March of 2018 and could not be happier.

Psychiatric Mental Health Nurse Practitioner

Patty Towle, PMHNP, ANP

Patty received her Bachelor of Science degree in Professional Nursing from UVM in 1985. She earned her Master’s degree in Adult, Ambulatory, Community Care from UMass in 1990 and began work as an Adult Nurse Practitioner in primary care. She has been at TCHC since 2011. Patty earned her post-Master’s certificate as a Psychiatric Nurse Practitioner from UNH in 2019. Since then, she has transitioned her practice from primary care to adult psychiatric care, providing care and psychiatric management for patients who have mental health needs.

In her free time, she enjoys biking, hiking, gardening, and spending time with family and friends.

Medical Social Worker/Therapist

Elizabeth (Liz) W Moss, LICSW

Liz grew up on the East coast, mainly in Vermont and Connecticut. She received her Bachelor of Arts (BA) in Sociology from Wittenburg University, in Springfield, Ohio, in 1993. Following graduation, she moved to Fort Wayne, Indiana, where she worked for 2 ½ years as a caseworker for Child Protective Services for the State of Indiana. She returned to Vermont to attend graduate school at the University of Vermont and received her Master of Social Work (MSW) in 1998; becoming licensed by the State of Vermont in 2002.

Since her graduation, Liz has worked with a variety of populations and in a variety of settings, with a goal to gain a comprehensive knowledge and skill set. Those populations include children and families, adolescents, homeless adults, children and adolescents in psychiatric hospital and residential care, adult men and women struggling with substance use disorders, and incarcerated men. In 2015, Liz was hired as a Medical Social Worker for the Community Health Team (CHT) at the University of Vermont Medical Center (UVMMC), where she worked for a year in multiple UVMMC and community clinics before being chosen by Thomas Chittenden Health Center (TCHC) to provide individual therapy to patients in-house.

When not at work, you can find Liz spending time with her dogs, Tulip and Iris, exploring the Vermont outdoors and spending time with good friends.

Social Work Care Coordinator

Lisa Anderson, LICSW

Lisa is a 6th generation Vermonter who was born and raised in Addison County. Despite her love of Vermont, after graduating from high school, Lisa spent some years in Massachusetts and in the British Isles working toward her Bachelor of Arts Degree in Psychology from Wheaton College in Norton, MA. After graduating, she worked with adults who experience intellectual challenges, just outside of Boston, until she sought her master’s degree in Social Work at Boston College. From there Lisa couldn’t wait to return home and has now worked in the Social Work field in Chittenden County for almost 20 years in various settings including residential and outpatient mental health and addiction treatment, primary care and hospital.

Lisa has been especially passionate about working with those affected by psychological trauma and addiction of all ages.  Lisa joined TCHC in 2018 and appreciates assisting people with meeting their medical and personal goals.

Nurse Care Coordinator

Margaret Pratt, LPN

Practice Administrator

Practice Administrator

Cheryl McCaffrey

Cheryl was born and raised in Vermont. She has been with Thomas Chittenden Health Center since 2010.

With over 20 years experience in health care management, Cheryl enjoys interacting with patients and working alongside her colleagues. When not working, she enjoys spending time with her family and good friends, having movie nights with her two dogs, playing with her horse, Zeke, reading and gardening.

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