<P> The character of Sheldon Cooper was inspired by a computer programmer personally known to series co-creator Bill Prady . He is named in honor of actor / producer Sheldon Leonard and Nobel Prize Laureate Leon Cooper . Chuck Lorre originally intended Johnny Galecki to play the role , but Galecki thought he would be `` better suited '' for the character of Leonard . Lorre said that when Jim Parsons auditioned for the role , he was `` so startlingly good '' that he was asked to reaudition `` to make sure he had n't gotten lucky '' . Sheldon is one of four characters to appear in every episode of the series , along with Leonard , Howard , and Raj . </P>
<P> The character of Sheldon Cooper was inspired by a computer programmer personally known to series co-creator Bill Prady . He is named in honor of actor / producer Sheldon Leonard and Nobel Prize Laureate Leon Cooper . Chuck Lorre originally intended Johnny Galecki to play the role , but Galecki thought he would be `` better suited '' for the character of Leonard . Lorre said that when Jim Parsons auditioned for the role , he was `` so startlingly good '' that he was asked to reaudition `` to make sure he had n't gotten lucky '' . Sheldon is one of four characters to appear in every episode of the series , along with Leonard , Howard , and Raj . </P>
who is the character sheldon cooper based on
who is the character sheldon cooper based on
a computer programmer personally known to series co-creator Bill Prady
a computer programmer personally known to series co-creator Bill Prady