John Allen Nelson

Biography

From Wikipedia, the free encyclopedia John Allen Nelson (born August 28, 1959) is an American actor.

Known For

Grey's Anatomy

as Arthur Soltanoff

Friends

as Paul

Criminal Minds

as Dan Murphy

NCIS

as Lloyd Manditsky

Castle

as Walter Dennis

CSI: Miami

as Mike Rydell

24

as Walt Cummings

CSI: Crime Scene Investigation

as Roger Gentry

Killer Klowns from Outer Space

as Dave Hanson

Quantum Leap

as Capt. Bill 'Bird Dog' Birdell