First Year Fellow
![Mary Margaret Barr, M.D.](/medicine/peds/images/Endo/Endo_-_Barr_Mary_MargaretSQUARE300.jpg)
Mary Margaret
Barr, M.D.
Residency: Emory University
Second Year Fellow
![Sarah Allan, M.D.](/medicine/peds/images/Fellows/Fellow_Headshots/2022_Headshots/Endo_-_Allan_SarahSQUARE300.jpg)
Sarah
Allan, M.D.
Residency: University of Tennessee Health Science Center
Second Year Fellow
![Marinés Castillo Echevarria, M.D.](/medicine/peds/images/Fellows/Fellow_Headshots/2022_Headshots/Endo_-_Castillo_MarinesSQUARE300.jpg)
Marinés Castillo
Echevarria, M.D.
Residency: Centro Medico Episcopal San Lucas & Ponce Health School of Medicine Consortium