Elizabeth K. B. Buck, MD

Board Certification: American Board of Internal Medicine American Board of Pediatrics

Dr. Buck received her MD from the Indiana University School of Medicine in 1991 and completed her residency in both Internal Medicine and Pediatrics at the University of North Carolina Hospitals at Chapel Hill.

Dr. Buck joined our practice in 1995, at which time we expanded to include pediatrics and changed our name to Adirondack Internal Medicine & Pediatrics, PC. She currently serves as President of the group.

She served on the Medical Executive committee at Adirondack Medical Center for six years, two years as president of the medical staff.

Dr. Buck has worked on the governance committee for the Adirondack Medical Home Pilot project over the last seven years and also sits on the Board of Directors of the Adirondacks Accountable Care Organization.

She is looking forward to spearheading a new Advanced Care Planning program through Adirondack Health. The program is modeled after the Respecting Choices program that was developed in LaCrosse, Wisconsin. She will be working with many other members of Adirondack Health staff and the surrounding communities to roll out this program throughout the region over the next two years.

She resides in Saranac Lake with her husband and reports both of their children are almost out of the nest. She enjoys all activities Adirondack, playing bridge, reading and working on her home and garden.


Patricia K. Monroe, MD, FAAP

Board Certification: American Board of Pediatrics

Originally from Saranac Lake, Dr. Monroe received her MD and completed her residency in Pediatrics at SUNY Upstate Medical University in Syracuse, NY.

She returned to the area in 1999 to begin her practice with our group. Dr. Monroe works at our Saranac Lake site.

Her special interest is infants and young children and she especially enjoys the ongoing relationships with the families of her patients that are part of private practice.

Dr. Monroe currently serves on the Board of Directors of Adirondack Medical Center and the Board of Directors of the Voluntary Health Agency.

She and her husband Ray live in Saranac Lake where they have raised their three sons.


Brian P. Guadagno, MD, FAAP

Board Certification: American Board of Internal Medicine American Board of Pediatrics

Dr Guadagno joined our practice in August 2010. He received his MD from Albany Medical College in 2006, and completed his training at Geisinger Health Systems in Pennsylvania, where he was Chief Resident in Internal Medicine and Pediatrics.

He currently serves as President of Trudeau Health System.

Dr. Guadagno is an avid outdoorsman; a member of the Catskill 3500 Club and the ADK 46er's.  He is working towards his winter 46er patch.

His other interests include travel, mountain biking and reading. 

Thompson Sarah Photo

Sarah M. Thompson, MD

Board Certification: American Board of Family Medicine

Dr. Thompson has lived and practiced in the Adirondacks since 2015. She received her MD from St. George’s University and completed her residency in Family Medicine at NYU-Langone Brooklyn.

Dr. Thompson resides in Lake Placid with her husband Curtis, two young children and their pug. They make frequent trips across the border to visit their family in Canada, but do also enjoy everything the Adirondacks has to offer.


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