Larry Kleinberg, a 20-year legal finance and operations head, has jumped to Allen Matkins Leck Gamble Mallory & Natsis in Los Angeles.

Kleinberg is stepping into the role of chief operating officer after his predecessor, Ralph Allen, joined Stroock & Stroock & Lavan in October. Kleinberg was most recently the executive director at Atkinson, Andelson, Loya, Ruud & Romo. He previously served in the same role at Munger Tolles & Olson for two years and was chief financial officer at Munger between 2001 and 2014.