The Staff at
The Valley Gamma Knife Center

Our Desired Outcome is the Same as
Yours – Results.

At The Valley Gamma Knife Center, we believe in starting with outcomes. It is with this in mind that we have invested in state-of-the-art technology, exceptional doctors, and a caring staff to provide the best possible outcome. Also, since we’re part of Valley Health System, we put our emphasis on your journey, with a goal of improving outcomes without forgetting how important it is to be human.

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Radiation Oncologists


Julie Lo, MS dABR

Steven Johnson, MS dABR

Matthew Worth, MS dABR

Ki Chak, PhD dABR

Susan Visco, BSN, RN, CNRN


Fig Sakollari, RN, BSN


Leigh Slagle

Registered Dietitian

Lovinder Kaur

Access Navigator

Deborah Panetta

Director of Gamma Knife