Amusement industry pioneer George Millay, who invented Sea World in San Diego and Magic Mountain near Los Angeles before launching the modern waterpark industry with Wet n' Wild in Orlando, died in his sleep Monday, his biographer said.

Millay, recipient of the Themed Entertainment Assn.'s Lifetime Achievement Award in 2003, passed away early Monday, said former AB editor Tim O'Brien, who chonicled Millay's accomplishments in his 2003 book "The Wave Maker."

Millay opened the first Sea World in 1964, Magic Mountain in 1971 and Wet n' Wild in 1977.