John Guillermin was a French-British film director, writer and producer who was most active in big-budget, action-adventure films throughout his lengthy career.
John Guillermin in 1970
I Was Monty's Double (film)
I Was Monty's Double is a 1958 film produced by the Associated British Picture Corporation and directed by John Guillermin. The screenplay was adapted by Bryan Forbes from the autobiography of M. E. Clifton James, an actor who pretended to be General Bernard Montgomery as a decoy during World War II.
Theatrical release poster