Here is my list:
James Cameron (Aliens, Terminator, Terminator 2: Judgement Day, The Abyss, Avatar)
Ridley Scott (The duellists, Alien, Blade Runner, Black Hawk down, Gladiator, The Martian)
Robert Zemeckis (Back to the Future trilogy, Contact, Romancing the Stone, Cast Away)
Steven Spielberg (Jurassic Park, Raiders of the Lost Ark, Indiana Jones and the Last Crusade, Jaws, Saving private Ryan, Shindler's list)
Peter Weir (Gallipoli, Witness, Dead Poets Society, Truman Show, Master & Commander)
Clint Eastwood (Unforgiven, Mystic River, Letters from Iwo Jima, Invictus, Sully)
Quentin Tarantino (Reservoir dogs, Pulp Fiction, Kill Bill, Django unchained, once upon a time in hollywood)
Sergio Leone (the dollar trilogy, Once upon a time in the West, Once upon a time in America)
Martin Scorsese (Goodfellas, Casino, Gangs of NY, the wolf of Wall Street, The Irishman)
Stanley Kubrik (Paths of Glory, 2001: a space odyssey, Barry Lyndon, Shining, Full Metal Jacket)
As
@NIGHTBRINGER can see, i've picked some of his choices as well, even if some of the iconic movies imo are different (see for example Ridley Scott)