In his personal life, Sellers struggled with depression and insecurities. An enigmatic figure, he often claimed to have no identity outside the roles that he played. His behaviour was often erratic and compulsive, and he frequently clashed with his directors and co-stars, especially in the mid-1970s when his physical and mental health, together with his alcohol and drug problems, were at their worst. Sellers was married four times and had three children from his first two marriages. He died from a heart attack, aged 54, in 1980. English filmmakers the Boulting brothers described Sellers as "the greatest comic genius this country has produced since Charles Chaplin".