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Our Physicians

Our medical team includes the following physicians:

• William B. Frymark, Jr., M.D., F.A.C.S.
• Eric Y.T. Yang, M.D., F.A.C.S.
• Michelle L. Kosik, M.D., F.A.C.S.
• Jocelin Sisto P.A.
• David Park, M.D.

A general surgeon is a physician who has been educated and trained in the diagnosis and preoperative, operative, and postoperative management of patient care.

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William B. Frymark, Jr., M.D., F.A.C.S.
Board-certified Surgeon

Education

• Southern Methodist University
  BA, Biology, 1970-1974
• Loyola University Stritch, Medical School
  M.D., 1974-1977

Training

• Internship
  Straight surgical, Cook County Hospital
  1977-1978
• Residency
  General surgery, Cook County Hospital
  1978-1982

Certification

• American Board of Surgery, 1983
• Recertification, 1990
• Recertification, 2003

Professional Memberships

• Illinois State Medical Society
• Dupage County Medical Society
• American College of Surgeons - Fellow
• Chicago Surgical Society

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Eric Y.T. Yang, M.D., F.A.C.S.
Board-certified Surgeon

Education

• University of Illinois, Urbana, IL
  BS, Honors Biology, cum laude, 1983
• Northwestern University Medical School, Chicago, IL
  M.D., 1987

Training

• Internship
  General surgery, McGaw Medical Center, Northwestern University Medical School
  Chicago, IL
  1987-1988
• Residency
  General surgery, McGaw Medical Center, Northwestern University Medical School
  Chicago, IL
  1988-1989 and 1990-1993
• Research fellow
  Department of Surgery, Northwestern University Medical School
  Chicago, IL
  1989-1990

Certification

• Diplomate, American Board of Surgery, 1994
• Recertification, 2003

Professional Memberships

• American College of Surgeons - Fellow
• American Society of General Surgeons
• American Society for Bariatric Surgery
• Society of Laparoendoscopic Surgeons
• Chicago Surgical Society
• American Medical Society
• Dupage County Medical Society
• Illinois State Medical Society

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Michelle L. Kosik, M.D., F.A.C.S.
Board-certified Surgeon

Education

• Loyola University, Chicago, IL
  BS, Magna Cum Laude, 1987-1990
• Rush Medical College, Chicago, IL
  M.D., 1990-1994

Training

• Residency
  General surgery, University of Illinois, Chicago, IL
  1994-1999

Certification

• American Board of Surgery

Professional Memberships

• American Medical Society
• The Society of Laparoscopic Surgeons

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David Park M.D.
Board Certified General Surgeon

Dr. Park is a Board Certified General Surgeon who completed his medical training at University of Southern California and Wayne State University. He received the teaching award as chief resident and served as the head of surgery while in the Air Force in Tucson, AZ. He performs all aspects of general surgery and has a special interest in minimally invasive surgery including the treatment of cancer. He is also a wound care specialist at Adventist La Grange Memorial Hospital.

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Jocelin Sisto P.A.
Physician's Assistant

Jocelin is a Certified Physician Assistant who completed her training at Midwestern University. She assists the physicians with patient care in the office, hospital and operating room. She also has a special interest in aesthetic services and laser treatments.

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