User blog comment:John Alfred Hammond, CEO/Who do you think would play JP Characters the Best?/@comment-7690264-20130924181603/@comment-6493791-20130924233932

I agree. Believe me, I'm not saying the film didn't do a fantastic job with the characters they created. However, the characters in the movie are supposed to be based on the characters of the same name from the novel. All I'm saying is, every time I read the novel, I see certain actors portraying the roles of characters based on how they've acted and appeared:

John Alfred Hammond - Richard Attenborough, albeit darker and greedier

Robert Muldoon - Robert Shaw, with a slightly-grayer mustache, wearing Khakis

Donald Genarro - Martin Ferraro, although less afraid and more couragous