How many movies have Henry O'Neill and Jack L. Warner collaborated on?

They have worked on 24 movies together! Their first movie together was Upperworld (1934) while their highest rated movie together was The Amazing Dr. Clitterhouse (1938). They have not worked together since Santa Fe Trail (1940). They are most known for their drama films together.

Role
Doctor
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Executive In Charge Of Production
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District Attorney (uncredited)
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Production Manager
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District Attorney
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Executive In Charge Of Production
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Dr. Clinton Forrest, Sr.
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Executive In Charge Of Production
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General Miguel Miramon
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Executive In Charge Of Production
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Attorney Kellogg
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Executive Producer
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Commander Tisdale
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Executive Producer
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Dr. Thomas Haslett
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Executive Producer
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Dr. Endicott
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Executive Producer
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Jim Carstairs
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Executive Producer
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Charlie Caldwell
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Executive Producer
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Ward Bryant
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Executive Producer
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Mr. Appleby
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Executive Producer
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John W. Hendricks
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Executive Producer
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Attorney J.L. Chase (uncredited)
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Executive Producer
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Inspector Crane
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Executive Producer
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Banker Making Toast at Banquet
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Executive Producer