Contact us at (800) USC-CARE (800-872-2273)


The CardioVascular Thoracic Institute at Keck Medicine of USC in Los Angeles consists of cardiothoracic surgeons, physician assistants, nurse coordinators and patient coordinators who work as a team to provide responsive, seamless, quality care to patients and their families. Each surgeon brings a special area of expertise to the mix, ensuring that patients receive the most optimal, appropriate care for their condition.

Surgeons are also integral members of the Division of Cardiothoracic Surgery, Department of Surgery, at the Keck School of Medicine of USC. Their involvement with the latest clinical trials and bench research, combined with their focus on teaching future cardiothoracic surgeons, keeps them on the leading edge of advances in cardiothoracic surgery. Patients directly benefit from this expertise.

Our Physicians


  • Mary Kearns-Jonker, PhD
  • Ching-Ling (Ellen) Lien, PhD
  • Ram Kumar Subramanyan, MD

Nurse Practitioners / Physician
Assistants / Research / Clinical Staff

  • Mahjabeen Aftab Hashmi OTR/L, CLT- LANA
  • Aziz Asaria, BAIST, Statistician/System Analyst
  • Ana Boicey, RN
  • Rose Hamm, PT, DPT, CWS
  • Christopher Justino, PA-C
  • Angela Kwan, MPT, CWS
  • Sophia Lam, ACNP-BC
  • Veronica Nunez, RN, MSN, FNP
  • Lee Nora, PA-C
  • Joyce Peralta, RN, MSN, ACNP-BC
  • Susana Perese, BS, RVT
  • Robert E. Sachs, PA-C
  • Mary Schoenbaum, ACNP-BC
  • Laura Sjoberg, RN, MSN, ACNP-BC
  • Perlie Tam, ACNP-BC
  • Cherilyn Wisco, ACNP-BC
  • Wendy Gui Xu, ANP-BC
Keck Medicine of USC is the University of Southern California’s medical enterprise, one of only two university-owned academic medical centers in the Los Angeles area.