John Showalter (director)
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. References

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American television directors
American television producers
Living people
American television editors
Place of birth missing (living people)
Year of birth missing (living people)