Physician Assistants (A-K)

Chief Physician Assistant

  • Roxanne Lightbody, MMSc, PA-C

    • Chief Physician Assistant

    Originally from Wisconsin, Roxanne Lightbody received her B.S. from the University of Dayton in Pre-medical studies with a minor in Psychology. She then attended Yale University's Physician Associate Program where she graduated with a Masters of Medical Science in 2006. After four years of working as a physician assistant for Mount Sinai's OB/GYN department, she joined the Hospitalist service in 2010.

Senior Physician Assistants

  • Janaira Caputo, PA-C

    • Senior Physician Assistant

  • Kate Gribetz, PA-C

    • Senior Physician Assistant

  • Alexandra Grout, PA-C

    • Physician Assistant

  • Marissa Machak, PA-C

    • Senior Physician Assistant
    Headshot of Marissa Machak, PA-C

  • Meghan McNamara, PA-C

    • Physician Assistant

    Meghan McNamara attended the University of Rochester where she obtained her BA in Psychology in 2008. In 2011 she graduated from NYU, having achieved a Master of Arts in Psychology. She then obtained her Master of Medical Science in Physician Assistant Studies from Mercy College in 2018. Meg joined the PA Medicine Service at NYP/ Columbia in Dec 2018. In 2023, Meg began serving as a Supervisor PA on the hospitalist service. 

  • Frances Pomerantz, PA-C

    • Senior Physician Assistant

    Franci Pomerantz attended St. John’s University where she received her Bachelor of Science in Physician Assistant Studies in 2012.  Franci joined the newly founded Nocturnalist service in October 2012 and was promoted to Supervisor PA in September 2018. Franci was awarded PA of the Year at the Columbia campus in 2019. She is grateful to have the opportunity to practice medicine at NYP/Columbia. 

Hospitalist Physician Assistants (A-K)

  • Ankita Arora, PA-C

    • Physician Assistant

  • Ashlynn Beachler, PA-C

    • Physician Assistant

    Ashlynn Beachler, originally from Ohio, attended Youngstown State University where she obtained a Bachelor of Science in General Studies in 2020. After completing her undergraduate studies, she worked as a Patient Care Assistant in a pediatric psychiatric crisis department before being accepted to Physician Assistant school. She graduated in May of 2023 from Baldwin Wallace University with her Master of Medical Science in Physician Assistant Studies before joining the Nocturnist team at CUIMC later in 2023.

  • Brigid Brosnan, PA-C

    • Physician Assistant

  • Matthew Bundy, PA-C

    • Physician Assistant

  • Bianca Campanella-Santiago, PA-C

    • Physician Assistant

    Bianca Campanella graduated from Saint Johns University with a degree in Physician Assistant Studies in 2015. She started her career at Montefiore Medical Center as a Hospitalist PA. She came to Columbia in 2016 and was a proud member of the Private Attending Clinician Service. She later transitioned back to a Hospitalist PA. She is proud to have stayed in internal inpatient medicine her entire PA career and takes great pride in providing quality, and compassionate care alongside the greatest team of doctors, nurses, and all Healthcare professionals possible at NYP. She is a happy to call the Hospitalist group family and proud to work with the most hardworking team around!

  • Sally Chan, PA-C

    • Physician Assistant

  • Kevin Chu, PA-C

    • Physician Assistant

  • Marinique Dabissiere, PA-C

    • Physician Assistant

    Marinique Dabissiere attended FAU (Florida Atlantic Univeristy) where she received a Bachelor of Arts in Biology. She subsequently attended UMDNJ-RWJ PA program where she received a Master's degree in Physician Assisstant. She worked for six years in Interventional Cardiology at Lenox Hill Hospital, then joined the PA Medicine Service at NYP/Columbia in September 2010.

  • Meghan Earl, PA-C

    • Physician Assistant

  • Jamie Frietag, PA-C

    • Physician Assistant

  • Madeline Gatzounas, PA-C

    • Physician Assistant

  • Rasheedah Grant, PA-C

    • Physician Assistant

  • Elizabeth Herbert, PA-C

    • Physician Assistant

  • Meghan Hileman, PA-C

    • Physician Assistant

  • Gabrielle Hilson, PA-C

    • Physician Assistant

  • Omar Ibrahim, PA-C

    • Physician Assistant

  • Jessica Jamin, PA-C

    • Physician Assistant

  • Harminder Kailey, PA-C

    • Physician Assistant

  • Preetkamal Kaur, PA-C

    • Physician Assistant

  • Andrea Kazlas, PA-C

    • Per-Diem Physician Assistant

    Andrea Kazlas was an English teacher and musician who became a Physician Assistant later in life. She started her medical career at the Montefiore Surgical Residency program, then worked briefly in Cardiothoracic Surgery before finding her niche in Internal Medicine. She is proud to be a founding member of the PACS service, and is grateful for the opportunity to participate in the excellence represented by NYP/Columbia.

  • Kellie Kolessar, PA-C

    • Physician Assistant

    Kellie attended Stony Brook University where she received a Bachelor of Science degree in Health Sciences. She then attended Thomas Jefferson University where she graduated in 2020 with a Master of Science degree in Physician Assistant Studies. She joined the Columbia/NYP Hospitalist service in December of 2020.