CLINICIANS
Biddle Location
Affinia Healthcare provides trusted health services through highly qualified and dedicated professionals at our locations. These clinicians, working alongside our dedicated staff and volunteers, have received their training and certifications from some
of the most highly regarded programs in the nation.
Dr. Amal Antoun
Pediatrics
Dr. Antoun graduated from the Ain Shams University, Faculty of Medicine, Abbasia, Cairo, Egypt . She specializes in Pediatrics.
Dr. Micaela O'Neil-Callahan
OB/GYN
Dr. O'Neil-Callahan earned her undergraduate degree from University of Wisconsin - Madison; medical degree from the University of Wisconsin - School of Medicine and Public Health; and completed her residency at Washington University. Dr. O'Neil-Callahan is board certified in obstetrics and gynecology.
Dr. Timothy McCann
Family Medicine
Dr. McCann provides internal medicine services for patients age 18 and older. He is a graduate of the American University of the Caribbean and completed his residency at St. Luke’s Hospital.
Patrick Schoenwalder
Physician Assistant
Patrick Schoenwalder, PA-C, MPH, earned his undergraduate degree from Drury University; a Master of Public Health from University of Illinois-Springfield; and a Masters in Medical Science–Physician Assistant degree from Saint Louis University. Patrick is also a board-certified Clinical Laboratory Scientist.
Summer Boyer
Nurse Practitioner – Women’s Health
Summer graduated with her BSN from Southern Illinois University - Edwardsville in 2000. She served as a Naval Nurse in the United States Navy. In 2011, Summer graduated from University of Missouri - St. Louis with a Master’s degree in Women’s Health.
Rebekah Hassler, CNM, MSN
Certified Nurse-Midwife
Rebekah earned her bachelor’s and master’s degrees in Nursing at Saint Louis University. She also has a post master’s in CNM from Frontier School of Midwifery and Family Nursing. Rebekah, who originally hails from Ft. Smith, Ark., also has a master’s certification in Spiritual Direction at Aquinas School of Theology. She also has an Advanced Evaluation & Management of Psychiatric Illness in Reproductive-Age Women certification through the ACNM Program. Rebekah says her goal is to make a difference for the better in patient's lives.
Dr. Barbara Lutey
Internal Medicine – Unhoused Team (Volunteer)
Biography to come.
Dr. Vivian Knipp
Psychologist
Dr. Knipp earned her undergraduate degree from the University of Missouri-Columbia in Psychology. She also earned her master's and doctorate in Psychology from Saint Louis University.
Rajeev John
Trama Informed Care Manager
Rajeev was born in India, where he earned his master’s in Social Work. He also has a MSW from Washington University. He joined Affinia Healthcare 32 years ago so that he could help people. When he’s not helping people, he enjoys traveling.
Allison Andrelchik
Licensed Clinical Social Worker
Allison Andrelchik completed her bachelor's degree at San Diego State University and master's degree in Social Work at Washington University in St Louis. She has worked with Affinia Healthcare since 2019, and enjoys spending time outside in nature, with her animals or reading a book.
Emme Harms
Licensed Clinical Social Worker
Emme earned her bachelor’s degree in psychology and Spanish from the University of Wisconsin La Crosse. She attended Washington University in St Louis where she studied social work. Emme specializes in diagnosis and treatment of young children and providing parent education and training and her specialties include anxiety disorders, ADHD, and Autism Spectrum Disorder.
Dr. Michele Abidin
Dental Director
Dr. Abidin earned her DDS at The Ohio State University and completed her residency in general dentistry at the University of Cincinnati.
Dr. Brad Bush
Dentist
Dr. Bush received his DMD degree from Southern Illinois University-School of Dental Medicine.
Dr. Heba Sarhan
Dentist
Dr. Sarhan earned her undergraduate degree from Xavier University of Louisiana and her DMD from the University of Alabama at Birmingham. She also completed a general practice residency at Mercy Hospital St. Louis.
Dr. Isaac Coronel
Dentist
Dr. Coronel earned his DMD at A.T. Still University through the Missouri School of Dentistry and Oral Health.
Dr. Paul Bigg
Dentist
Dr. Bigg earned his DMD at Case Western Reserve University School of Dental Medicine and completed his residency in general dentistry at Erie County Medical Center in Buffalo, New York.
Sherrie Costello
Registered Dental Hygienist
Sherrie earned her RDH license in 2012 after she completed her associate's degree at St. Louis Community College at Forest Park. She has been in the dental field since 1990 and has worked in all aspects of the dental office. In her many years of dentistry, she has worked as a chairside dental assistant, front office assistant, office manager and clinical dental hygienist.
