Famous comic book writer and illustrator who was best known for his innovative work on "The Avengers," "The New Teen Titans," "Crisis on Infinite Earths," and "Wonder Woman." He also worked for the publisher, CrossGen.
He was hired as an assistant by famed artist Rich Buckler in 1973. He debuted in Marvel Comics' "Astonishing Tales" #25 from August 1974.
He won the Eagle Award, which honored comic book authors, four times between 1979 and 2000.
He was born to factory workers who relocated to the Bronx, New York, in the 1940s from Caguas, Puerto Rico. He began drawing at the age of five. He married Carol Flynn.
He gave a contemporary twist to many of the Marvel Comics characters co-created by Stan Lee.