Sheldon Lee Cooper, B.S., M.S., M.A., Ph.D., Sc.D., is a fictional character on the CBS television series The Big Bang Theory, portrayed by actor Jim Parsons. Parsons won an Emmy Award in 2010 and a Golden Globe in January 2011 for this role.
Rajesh Ramayan "Raj" Koothrappali, Ph.D (born October 6), is a fictional character on the CBS television series The Big Bang Theory, portrayed by actor Kunal Nayyar.
Dr. Leonard Leakey Hofstadter is a fictional main character of the CBS television series The Big Bang Theory, and is portrayed by actor Johnny Galecki. Leonard is an experimental physicist who shares an apartment with colleague and best friend Sheldon Cooper (Jim Parsons). Leonard and Sheldon are named after actor/producer Sheldon Leonard, and Nobel Prize Laureates Robert Hofstadter and Leon Cooper.
Nora Maureen Holden Walker is a fictional character on the television drama, Brothers & Sisters. She is portrayed in the series by veteran actress Sally Field. Nora is the main character of the series. Sally Field was one of the two characters to appear in all the episodes of the series.