Adam West starred in the Batman TV show that revitalized Batman in the 1960s. According to his biography, he was a Batman fan since very young. He liked the dual action hero / detective aspect of Batman. After a few years of working in a Hawaiian TV show, he finally landed his signature role as Batman in the 1966 show. Since then, he has over 60 movie and 80 TV show credits, including appearing as himself in Family Guy.
Batman is his most iconic role, and it seems like he looks back at it as fondly as his fans do. He had a cosmetic dentist put a little Batman logo in one of his molars! No word on whether it contains some sort of secret spray that gives him fresh breath when he presses the little logo though.