Physician Assistants

Kara Cossis PAKara Cossis, PA-C

Director, Physician Assistants

Certified by the National Commission on Certification of Physician Assistants
Licensed by the Maryland Board of Physicians

        • West Virginia Wesleyan College, B.S., B.A. cum laude
        • SUNY Stony Brook, B.S., Physician Assistant Program

Kara has been a Physician Assistant since 2006 and serves at Chesapeake Urology's Union Memorial Hospital office. She performs assessment, diagnosis and treatment of patients in the hospital, ER and office, performs hospital consultations, and assists with surgery.


Stephen Brown PA

Stephen Brown, PA-C

Certified by the National Commission on Certification of Physician Assistants
Licensed by the Maryland Board of Physicians

        • Towson State College, B.S.
        • Essex Community College, Physician Assistant Program
        • University of Nebraska College of Medicine, MPAS (Master of Physician Assistant Studies)

Stephen has been a Physician Assistant since 1980. He serves at the Good Samaritan office. He performs assessment, diagnosis and treatment of patients in the hospital, ER and office, performs hospital consultations, and assists with surgery. In addition to a strong neurosurgical specialization, he is experienced in internal, emergency, occupational and military medicine. He served one year in Operation Iraqi Freedom. 


Sata DenninSara A. Dennin, PA-C

Certified by the National Commission on Certification of Physician Assistants
Licensed by the Maryland Board of Physicians

        • Elon University, B.S. in Chemistry
        • Elon University, Physician Assistant Program; Master's of Science, Physician Assistant Studies

Sara joined Chesapeake Urology in October 2016 as a physician assistant and will be working in the Brandywine office. She sees inpatient/ER consultations, manages post-operative patients, and performs admissions and discharges. 



Donald Diefendorf, PA

Donald S. Diefendorf, PA-C

Certified by the National Commission on Certification of Physician Assistants
Licensed by the Maryland Board of Physicians

        • Washington College, B.A. Psychology
        • Essex Community College, Physician Assistant Certificate 
Donald joined Chesapeake Urology as a physician assistant in 2016 in the Woodholme Medical Center office in Pikesville. He works with urology patients at Carroll County, Northwest and Sinai hospitals. Donald has worked as a physician assistant since 1999 in various capacities. Prior to joining Chesapeake Urology, he served as a physician assistant with the Department of Surgery and Neurosurgery at Mercy Medical Center in Baltimore.

Misa Francis

Misa S. Francis, PA-C

Certified by the National Commission on Certification of Physician Assistants
Licensed by the Maryland Board of Physicians

        • Arizona School of Health Sciences, M.S., Physician Assistant Studies
        • SUNY Stony Brook, B.S., Physician Assistant Program
        • Sweet Briar College, B.S., Cum Laude

Misa has been a Physician Assistant since 2006 and serves in the Woodholme office. She performs assessment, diagnosis and treatment of patients in the hospital, ER, and office, performs consultations, and assists with surgery. Prior to joining Chesapeake Urology, Misa worked in hospitalist medicine at Northwest Hospital and orthopedic trauma at the R. Adams Cowley Shock Trauma Center.

 
Ralph Garrett PA

Ralph Garrett, PA-C

Certified by the National Commission on Certification of Physician Assistants
Licensed by the Maryland Board of Physicians

        • University of Baltimore, B.A.
        • Essex Community College, Physician Assistant Program

Ralph sees patients at the Bel Air office as well as urology consultant at Upper Chesapeake Medical Center and Harford Memorial. He has been a PA for over 30 years and is an adjunct faculty member at Towson University and CCBC. His experience includes positions as chief and senior PA roles in urology.

 
Ally Gordon PA_C

Ally Gordon, PA-C

Certified by the National Commission on Certification of Physician Assistants
Licensed by the Maryland Board of Physicians

        • Medical School of Vitebsk State University, Vitebsk, Belarus, M.D.
        • Central City Hospital, Gomel, Belarus, OB/Gyn residency
        • Towson University/Essex Community College, M.S. with Distinction, Physician Assistant Program

Ally served as an OB/Gyn in her native Belarus, where she practiced from 1990 to 2001. She worked as a Physician Assistant in Baltimore area hospitals before joining Chesapeake Urology's Continence Center. She provides urological consulting and sees patients in the hospital and ER at Northwest and Sinai Hospitals. She specializes in the evaluation, treatment and follow-up of patient with continence issues, pelvic prolapse, pelvic pain and related conditions.

 
Mary Beth Mendoza PA

Mary Beth Lennox Mendoza, PA-C

Certified by the National Commission on Certification of Physician Assistants
Licensed by the Maryland State Board of Physicians
Delineated by the Maryland State Board of Physicians Quality Assurance for Central Line and Chest Tube Placement

        • Essex Community College, Physician Assistant Program Certificate
        • West Virginia University, B.S., magna cum laude

Mary Beth has been a Physician Assistant since 1997. She serves the Westminster office team, and is the urology consultant for Carroll County General Hospital. She has training in the management of critically ill patients, post-operative management and invasive procedures. She performs assessment, diagnosis and treatment of patients in the hospital and the emergency room. She previously worked at Northwest Hospital in the Critical Care Unit.


Mike Ritmiller PA

Michael Ritmiller, MPAS, PA-C

Certified by the National Commission on Certification of Physician Assistants
Licensed by the Maryland Board of Physicians

        • Community Colleges of Baltimore County, A.A.
        • Towson University, B.S., cum laude
        • Towson University/Essex Community College, MPAS., Physician Assistant Program

Michael has been a Physician Assistant since 2005. He is mainly based at the University of Maryland Rehabilitation and Orthopaedics Institute, where he manages and runs a Urology Clinic and a Urodynamics Clinic. He has special training in neuro-urology, urodynamics and performing cystoscopies. His experience includes serving as a U.S. Navy Hospital Corpsmen, an operating room technician, and a surgical assistant.

 

Wendy Subasic PAWendy Subasic, PA-C

Certified by the National Commission on Certification of Physician Assistants
Licensed by the Maryland Board of Physicians

        • Towson University, Masters in Physician Assistant Studies
        • College of Notre Dame, B.A. Biology

Wendy has been a Physician Assistant since 2006.  She works at Chesapeake Urology's Saint Agnes office and makes rounds at Saint Agnes Hospital and Harbor Hospital.  Wendy has a strong background in the emergency room and is certified in femoral central lines and lumbar punctures.


Wendy Sullivan PA

Wendy Sullivan, PA-C

Certified by the National Commission on Certification of Physician Assistants
Licensed by the Maryland Board of Physicians

        • King's College, B.S.
        • King's College, Physician Assistant Certificate

Wendy has been a Physician Assistant since 2001 and assists the Franklin Square office team and covers Franklin Square Hospital. She performs assessment, diagnosis and treatment of patients in the hospital, ER and office. Wendy also performs hospital consultations, and assists with surgery. Her previous work experience includes Johns Hopkins Bayview Medical Center and Virginia Urology.

 
Larry Waskow PA

Larry Waskow, M.A.S., PA-C

Certified by the National Commission on Certification of Physician Assistants
Licensed by the Maryland Board of Physicians

        • Frostburg State College, B.S. Biology
        • Johns Hopkins School of Health Sciences, Essex Community College, A.A. and certificate with high honors, Physician Assistant Program
        • Johns Hopkins, Masters in Administrative Science

Larry has been a Physician Assistant since 1978. He is experienced in both hospital and office urologic care and performs consultations and assessment, diagnosis, and treatment of patients in the hospital, ER and office. He previously worked at Homewood Hospital, University of Maryland Medical Center and Sinai Hospital in general surgery, neurosurgery, and urology.


Melissa Brooks, PA-C

Certified by the National Commission on Certification of Physician Assistants
Licensed by the Maryland Board of Physicians

  • Towson University/CCBC Essex, Master's, Medical Science
  • Towson University/CCBC Essex, Physician Assistant Certificate
  • Gettysburg College, B.A., Health Sciences

Melissa joined Chesapeake Urology in 2014 and makes rounds at the Greater Baltimore Medical Center.  Previously she was a critical care physician assistant at the Baltimore Washington Medical Center.  Melissa performs assessment, diagnosis and treatment of patients in the hospital, ER and office, performs hospital consultations, and assists with surgery.


Robin A. Thomas, PA-C

Certified by the National Commission on Certification of Physician Assistants
Licensed by the Maryland Board of Physicians

  • University of Maryland College Park, B.S. in Chemistry
  • University of Maryland School of Medicine, B.S. in Medical & Research Technology
  • Towson University/CCBC Essex, Master's of Science, Physician Assistant Studies

Robin has been a physician assistant since 2006 and joined Chesapeake Urology's O'Dea office in Towson in July 2016. Robin sees inpatient/ER consultations, manages post-operative patients, and performs admissions and discharges.