Meet the Team

Please meet our core staff of physicians, nurse practitioners, and physician assistants.

Physicians

Bassam Aldeeb, DO
with GSEP since September 2021

Henry Bacher, MD
with GSEP since September 2021

Mandie Baker, MD
with GSEP since August 2017

James Black, MD
with GSEP since July 2014

Brad Boothby, MD
with GSEP since September 2014

Thomas Bosen, MD
with GSEP since August 2020

Karla Canseco, MD
with GSEP since October 2021

Glennette Castillo, MD
with GSEP since August 2024

Garrett Christy, MD
with GSEP since July 2021

Dean Cromwell, MD
with GSEP since August 2014

Ryan Cruz, MD
with GSEP since July 2018

Gary Dufresne, DO
with GSEP since May 2014

Patrick Eitter, MD
with GSEP since February 2013

Erasmo Espino, MD
with GSEP since August 2020

Austin Flowers, MD
with GSEP since August 2022

Robert Frolichstein, MD
with GSEP since June 2002

Craig Gerstenkorn, MD
with GSEP since January 1993

Jeffrey Hayes, DO
with GSEP since August 2022

Shannon Hempstead, MD
with GSEP since March 2022

Matthew Hennessey, DO
with GSEP since August 2024

Megan LaGrange, MD
with GSEP since August 2024

Paul Lillich, MD
with GSEP since July 2014

Kent Martin, MD
with GSEP since July 2019

Sumeru (Sam) Mehta, MD
with GSEP since November 2007

Rachel Metz, MD
with GSEP since July 2012

Colin Meyer, MD
with GSEP since August 2015

Matthew Miller, MD
with GSEP since July 2018

Larry Newton, MD
with GSEP since September 2023

Jeniffer Okungbowa-Ikponmwosa, MD
with GSEP since August 2022

Pooja Patel, MD
with GSEP since July 2023

Jennifer Pease, MD
with GSEP since July 2014

Ponder pic

Melissa Ponder, MD
with GSEP since January 2022

George-Thomas Pugh, MD
with GSEP since August 2022

Andrea Purpura, MD
with GSEP since July 2023

Salim Rezaie, MD
with GSEP since August 2016

Randall Schuster, MD
with GSEP since July 2007

Charles Stephens, MD
with GSEP since August 2016

Matthew Streitz, MD
with GSEP since August 2018

Chris Welton, MD
with GSEP since July 2018

Jessica Wentling, DO
with GSEP since August 2017

Daniel White MD
with GSEP since August 2024

Cameron Williams MD
with GSEP since September 2024

Justin Williams MD
with GSEP since September 2013

Robert Wilson, MD
with GSEP since July 1995

Chloe Woodington, MD
with GSEP since August 2021

Nurse Practitioners and Physician Assistants

Paula Montanaro, NP
Lead APP
with GSEP since September 2013

Jessica Arispe, NP
with GSEP since April 2016

Stacy Bratcher, NP
with GSEP since March 2017

Vanessa Briones, NP
joined GSEP October 2019

Kimberly Candler, NP
joined GSEP October 2022

Aaron Cardona, NP
joined GSEP November 2023

Justin Cortez, NP
with GSEP since August 2023

John Curran, PA
with GSEP since May 1998

Tiffany Garrett, NP
joined GSEP November 2022

Laura Haynes, PA
with GSEP since June 2017

Justin Hill, PA
with GSEP since May 2023

Theresa Mund, NP
with GSEP since 2021

Hector Pallares, NP
with GSEP since November 2017

Courtney Shaw, PA
with GSEP since June 2020

Sean Therien, PA
with GSEP since May 2023