Click on the yellow Covid-19 button on our homepage (next to the Portal button) for up-to-date information about Covid testing, symptoms, and vaccines.

Starting, Monday, October 4th, our Burlington office will be at our new location across the Hannaford shopping plaza in Suite 1 next to Snap Fitness!

South Burlington Office

Patrick Duff, M.D.

Dr. Duff grew up on Cape Cod and received his undergraduate degree in biology from Emmanuel College in Boston. Dr. Duff worked in immunology research at Massachusetts General Hospital in Boston before pursuing medicine. While in Boston, he met his wife, a native Vermonter, before moving to New York for medical school. Dr. Duff received his medical degree from New York Medical College. He jumped at the opportunity to return to beautiful Vermont with his wife, who is a physician assistant, and completed his pediatric residency at UVM Children’s Hospital. Dr. Duff enjoys caring for children of all ages, and has particular interests in pulmonology, allergy, and adolescent medicine. He enjoys spending time at home with his wife, daughter, dog and two cats. He also enjoys cooking, hiking, and kayaking. Now that he's a Vermonter, he plans to learn to ski. Dr. Duff will begin seeing patients at Timber Lane in July 2021.

Leah Costello, M.D., F.A.A.P.

Dr. Leah Costello grew up in South Burlington and received her undergraduate degree at Bates College in Maine. She attended the University of Vermont College of Medicine and then moved to Salt Lake City, Utah for her pediatrics residency at the University of Utah. Upon completing her residency, she spent four years as a general pediatrician in Salt Lake City. After the birth of their first child, she and her husband decided to return to Vermont to be near family and raise their children in this beautiful state. Before joining Timber Lane Pediatrics in the fall of 2016, Dr. Costello worked as a hospitalist at University of Vermont Children's Hospital. Dr. Costello enjoys caring for all children of all ages and has a particular interest in early childhood development, adolescent health care and quality improvement. She and her husband, who is a photographer, enjoy spending time with their son and daughter, alpine skiing, mountain biking, traveling and cooking for family and friends.

Thomas Bolduc, M.D., F.A.A.P.

Dr. Bolduc, a native of Portland, Maine, met his wife at the University of Vermont College of Medicine.  After finishing both of their pediatric residencies at UVM, they worked as pediatricians for the US Navy in Yokosuka, Japan and Bremerton, Washington.  After leaving the Navy, they spent the next ten years sharing a pediatric practice in Walla Walla, Washington while raising their two sons and exploring the western U.S.  In 2013, after 14 years away, they decided it was time to come “home” to Vermont.  Dr. Bolduc enjoys hiking, snowshoeing, flat-water kayaking, cooking, and time in his hammock.

Elizabeth Hunt, M.D., F.A.A.P., I.B.C.L.C.

Dr. Hunt, a native of New Jersey, studied community health at Brown University and then joined the Peace Corps.  She served in rural Ecuador as a public health volunteer for two years.  She completed her pediatric residency at UVM/Fletcher Allen Hospital and worked as a newborn hospitalist here at Fletcher Allen.  She was also staff physician at Woodside Juvenile Rehabilitation Center in Burlington, VT for two years.  Dr. Hunt then worked at the Mayo Clinic in Minnesota in general practice and as a newborn hospitalist.  She has experience in immunization research, urban public health outreach, speaks near-fluent Spanish, has volunteered in Haiti.  Dr. Hunt joined Timber Lane Pediatrics in 2011.  Dr. Hunt is particularly interested in breastfeeding medicine, infectious disease and children’s mental health and wellness. She enjoys spending time with her husband, Jesse Moore, a surgeon at Fletcher Allen, and their three young boys. She likes sailing, hiking and reading.

Monica Fiorenza, M.D., F.A.A.P.

Dr. Monica Fiorenza grew up in Burlington, VT.  As a child, she was a patient of Dr. Murray’s here at Timber Lane Pediatrics .  She graduated from Rice Memorial High School in South Burlington.  After completing her undergraduate degree in chemical engineering at Clarkson University in Potsdam, NY, she obtained her medical degree from the University of Vermont College of Medicine and completed her pediatric residency at the University of Rochester.  She spent time volunteering as a pediatrician on the island of St. Lucia before joining Timber Lane Pediatrics in 2003.  She lives with her husband, Dr. Gregory McCormick, and their 3 daughters in Hinesburg.  Dr. McCormick is an ophthalmologist with Ophthalmic Consultants of Vermont at 55 Timber Lane, right down the hall from Timber Lane Pediatrics.  She enjoys spending time with her family and friends, skiing at Mad River Glen, and waterskiing.   

Barbara Kennedy, M.D., F.A.A.P.

Dr. Barbara Kennedy, a native of Madison, Wisconsin, and her husband, an ER physician, graduated from the Medical College of Wisconsin and did their residencies in Rochester, NY.  They worked in Nashville, TN for several years before moving to the San Francisco Bay area, where Dr. Kennedy worked for the Palo Alto Medical Center while her husband got his MBA at Stanford.  In 1993 they saw the light and moved to Shelburne, VT with their 4 daughters.  Dr. Kennedy enjoys caring for all pediatric patients from birth through college.  Her area of special interest is wilderness and travel medicine.  She has authored several medical textbook chapters and written pediatric guides to wilderness and foreign travel.  She and her husband have traveled with their daughters to six of the seven continents.  Dr Kennedy also enjoys running, biking, and skiing and is a proud member of the nationally competitive “Vintage,” a women’s 50 and over ice hockey team. 


Katherine Margulius, P.A.

Katharine (Kate) Margulius, PA-C, has been a practicing physician assistant since 2000.  She joined our practice in June 2009.  She graduated from the University of New England in Southern Maine as a physician assistant with a Master of Science degree.  Kate is licensed by the State of Vermont and certified by the NCCPA.  She enjoys caring for families with children of all ages and has special interests in women’s health, adolescent and college health.  Her non-working hours are spent with her husband, parenting their 3 children and spending as much time as possible outdoors.


Rebecca Nagle, P.N.P., I.B.C.L.C.

Rebecca has been a registered nurse for twenty years and has been a pediatric nurse practitioner since 1999. She graduated with a nursing degree from the University of Vermont in 1991 and from the University of California, San Francisco in 1999 with a Master’s Degree in Child Health and a Pediatric Nurse Practitioner Certificate.  Rebecca enjoys caring for all pediatric patients, birth through college, and has special interests in lactation, newborns and adolescents.  Rebecca has traveled and worked in international health care for 16 years, focusing on child and maternal health.  She works part-time and spends her non-working hours with her husband and three children. They enjoy traveling, skiing, surfing, mountain biking and playing outdoors.


Leah Macaulay, P.N.P

Leah Macaulay, PNP, has worked in pediatrics in Vermont for over 10 years. She completed her nursing degree at UVM in 2007 and went on to Boston College to become a Certified Pediatric Nurse Practitioner. Leah believes in a family-centered approach to caring for children. She loves working with children and families of all ages. Leah has a special interest in newborn care and lactation as well as pediatric nutrition. Leah is a born and raised Vermonter. She met her husband while attending UVM and they are grateful to be raising their two children here in South Burlington.


Kristen Bird, R.N., F.N.P, I.B.C.L.C.

 Kristen moved to Vermont from Pennsylvania when she was in high school. Kristen attended college in Greenville, SC and received her nursing degree there in 2007.  Kristen worked as an RN for nearly 6 years on the Mother/Baby unit at Fletcher Allen. In 2011, she completed her degree as a family nurse practitioner at Indiana State University.  She joined Timber Lane Pediatrics in 2012. Kristen is a board-certified lactation consultant and enjoys using her skills to help breastfeeding moms both at Timber Lane and in the community. She and her husband David volunteer at their church and enjoy working with the youth group there. Kristen loves all of pediatrics but is especially interested in breastfeeding, newborn care, and adolescent health. She loves to spend her free time with her husband, 3 children, and Shih Tzu, Teddy, and enjoys hiking, kayaking and spending time with friends.

Timber Lane Pediatrics South Burlington

51 Timber Lane
South Burlington, VT 05403

Phone: (802) 864-0521
Fax: (802) 735-9621

Office Hours by Appointment
Monday - Friday 8:30 AM - 5:00 PM

Saturday and Sunday 8:30 AM - 12:00 PM*

Due to the Covid-19 outbreak, we have suspended our walk-in hours.

Timber Lane Pediatrics Burlington

Office location:
1127 North Avenue, Suite 41-Moving 10/4/21 to Suite 1!
Burlington, VT 05408

Mailing address:
PO Box 3057
Burlington, VT 05408

Phone: (802) 846-8100
Fax: (802) 735-9337

Office Hours by Appointment
Monday - Friday 8:30 AM - 5:00 PM
Closed Saturday and Sunday

Due to the Covid-19 outbreak, we have suspended our walk-in hours.

Timber Lane Pediatrics Milton 

11 Haydenberry Drive, Suite 103
Milton, VT 05468

Phone: (802) 893-1200
Fax: (802) 735-9608

Office Hours by Appointment
Monday - Friday 8:30 AM - 5:00 PM
Closed Saturday and Sunday

Due to the Covid-19 outbreak, we have suspended our walk-in hours.