Tom Skerritt — American Actor born on August 25, 1933,

Thomas Roy "Tom" Skerritt is an American actor who has appeared in more than forty films and more than two hundred television episodes since 1962. He is known for his roles in MASH, Alien, Top Gun, A River Runs Through It, Up in Smoke, and the television series Picket Fences... (wikipedia)

One has the responsibility to oneself, to the writer, director and the people who put up the money, to put out the best of what one has experienced and understood about the human condition as it relates to the role one has been hired to portray.
Just being hired by a great director is complimentary.
As a very experienced writer once told me, 'It's in the rewrites'.
I'm currently trying to direct my own material.
Most screenplays depend primarily on the vision of a director.