Production Credits
John F. Showalter has 28 production credits.Production
Credited for Executive Producer in 1 show - Timeless.
Credited for Co-Executive Producer in 1 show - Supernatural.
Directing
Credited for Director in 25 shows - Cold Case, House, Supernatural, Threshold, Criminal Minds, Ghost Whisperer, Viva Laughlin, The Mentalist, Nikita, Fairly Legal, Alphas, Unforgettable, Revolution, Arrow, Sleepy Hollow, The 100, Forever, The Flash, Constantine, Supergirl, DC's Legends of Tomorrow, Timeless, Frequency, S.W.A.T. and The Winchesters.
Editing
Credited for Editor in 1 show - Charlie Grace.