South Burlington Office

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Whitney Sevey, M.D.

Dr. Whitney Sevey grew up in Rhode Island and completed an 8 year combined program at the University of Connecticut where she studied physiology and neurobiology during her undergraduate years before moving on to medical school.  She was thrilled to move to Vermont and join the team at the UVM Children’s Hospital for her pediatric residency and was privileged enough to stay on for an additional year as Chief Resident after completing her 3 years of training.  She is excited to begin seeing patients at Timber Lane and to put down more permanent roots in Vermont with her husband and son.  She loves to knit, cook, read, and explore the great outdoors through any means possible; especially tennis, hiking, skiing, and disc golf!

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.

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.

Gussie Logan, D.N.P., APRN, FNP-C

Gussie is a board certified Family Nurse Practitioner and a native Vermonter. She earned her Doctorate in Nursing Practice from the University of Vermont in 2019 while working as an RN at Timber Lane Pediatrics. Gussie then practiced as a NP for two years at a pediatric practice in Southern Vermont before returning to Timber Lane Pediatrics in the fall of 2021. She enjoys spending time with her husband and baby, being active outdoors, running, biking, hiking and is an avid baker. Gussie always knew she wanted to care for the pediatric population and finds her strengths are making connections with patients and families

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.


Leah Macaulay, P.N.P, I.B.C.L.C.

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 is a board-certified lactation consultant with a special interest in breastfeeding infants.  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.

Our Locations


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 8:30 AM - 12:00 PM
Sunday Closed

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

Timber Lane Pediatrics Burlington

Office location:
1127 North Avenue, 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 Covid 19, we have suspended 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 Covid 19, we have suspended walk-in hours.