They were, Marion Gering, George Cukor, Leo McCarey and George Stevens.
Marion Gering:
19th June 1901 - 19th April 1977
Devil and the Deep (1932)
With Charles Laughton and Tallulah Bankhead.
Madame Butterfly (1932)
With Sylvia Sidney
Thirty-Day Princess (1934)
Again with Sylvia Sidney
George Cukor:
7th July 1899 - 24th January 1983
On Grant -"One of the reasons he was so successful as an actor was that he truly just behaved like he was a normal guy and like he didn't look like that."
Sylvia Scarlett (1936)
With Katharine Hepburn.
Holiday (1938)
Again with Katharine Hepburn.
The Philadelphia Story (1941)
With George Cukor, John Howard and Katharine Hepburn.
George Cukor was awarded an Oscar for Best Director for The Philadelphia Story. He also directed many Oscar nominated performances.
Leo McCarey:
3rd October 1898 - 5th July 1969
The Awful Truth (1937)
Publicity shot with Irene Dunne and Leo McCarey.
Leo McCarey won the Oscar for Best Director.
Once Upon A Honeymoon (1942)
With Ginger Rogers.
An Affair to Remember (1957)
With Deborah Kerr.
George Stevens :
18th December 1904 - 8th March 1975
Gunga Din (1939)
On the set of Gunga Din (above) relaxing and (below) with George Stevens.
Penny Serenade (1941)
On set of the film that bought him his first Oscar nomination.
The Talk of the Town (1942)
With George Stevens, Jean Arthur and Ronald Colman.
Four directors completed two film projects each with Cary Grant...
..."Lights, camera...action!" - The Directors - Part 5