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.
Career 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 Days, Timeless, and The 100.John Showalter credits, TV Guide.com
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