John F. Showalter is an American television director and editor.
He is well known for his work on Without a Trace, The Mentalist and Supernatural.
Showalter's directing credits include Ghost Whisperer, House, Criminal Minds, Without a Trace, Supernatural, The Mentalist, Supergirl, and The Flash, as well as editing episodes of Lois & Clark: The New Adventures of Superman, Gideon's Crossing, Glory…
