Sorry, not a chance in hell I could stick to 10, a top 22 then

Alfred Hitchcock - Vertigo, North By Northwest, Psycho.
Robert Aldrich - Ulzana's Raid, The Dirty Dozen, Kiss Me Deadly.
Anthony Mann - Raw Deal, Devil's Doorway, Winchester '73
Sam Peckinpah - The Wild Bunch, Straw Dogs, Cross of Iron.
Jacques Tourneur - Canyon Passage, Out Of The Past, Night Of The Demon.
John Ford - The Searchers, Stagecoach, Fort Apache.
Budd Boetticher - Commance Station, The Tall T, Ride Lonesome.
Robert Siodmak - The Spiral Staircase, The Killers, Criss Cross.
Billy Wilder - The Lost Weekend, Some Like It Hot, Sunset Blvd.
Joseph Losey - The Prowler, Time Without Pity, The Servant.
Edward Dmytryk - Warlock, The Caine Mutiny, Crossfire.
Nicholas Ray - They Live By Night, In A Lonely Place, Johnny Guitar.
Fritz Lang - M, Fury, Scarlet Street.
John Sturges - The Great Escape, The Magnificent Seven, Bad Day At Black Rock.
John Carpenter - Assault on Precinct 13, The Thing, Escape From New York.
Preston Sturges - Christmas in July, The Miracle of Morgan's Creek, The Palm Beach Story.
Frank Capra - Mr. Deeds Goes to Town, Meet John Doe, It's A Wonderful Life.
Howard Hawks - The Big Sleep, Red River, Sergeant York.
Marcel Varnel - Oh, Mr. Porter!, Ask A Policeman, The Ghost of St. Michael's.
Carol Reed - The Third Man, Odd Man Out, The Fallen Idol.
David Fincher - Seven, Fight Club, Zodiac.
Michael Mann - Manhunter, Heat, Collateral.