​From Wikipedia, the free encyclopedia. Christopher "Chris" Lowell (born October 17, 1984) is an American television actor. He played the role of Stosh "Piz" Piznarski in the CW noir drama Veronica Mars and most recently played the character William "Dell" Parker in the ABC Grey's Anatomy spin-off, Private Practice. Description above from the Wikipedia article Chris Lowell, licensed under CC-BY-SA, full list of contributors on Wikipedia