Film industry marketing executive Geoffrey Ammer, who was most recently president of worldwide marketing at Relativity Media but resigned after less than six months in the post in August 2010, died Sunday morning of a heart attack in Santa Monica. He was 62 and seemingly in excellent health.

In addition to Relativity, Ammer did stints in senior marketing posts at Sony Pictures, 20th Century Fox, Disney and Marvel Studios, and led his own independent marketing firm, G2 Consulting.

Ammer’s most recent effort was distribution and marketing company Clarius Capital, which was developing its first film.

In 2008, Ammer was named president of worldwide marketing and home entertainment at Marvel Studios, where he successfully led the marketing efforts for its first self-produced films, including “Iron Man” and its first sequel, “The Hulk” and “Thor,” before Disney acquired the company.

His clients included Adam Sandler’s Happy Madison, Revolution Studios, Steve Bing’s Shangri-La Entertainment and Level 1 Entertainment.

Before he launched G2, Ammer was president of worldwide marketing for the Columbia TriStar Motion Picture Group. He was a marketing consultant for Sony Pictures Entertainment and oversaw that studio’s marketing campaigns until 2006, including those for “Spider-Man” and “Spider-Man 2,” “Hitch,” “The Grudge,” “50 First Dates,” “Bad Boys 2,” “Something’s Gotta Give,” “Charlie’s Angels: Full Throttle,” “S.W.A.T.,” “XXX,” “Anger Management,” “Men in Black II,” “Panic Room” and “Black Hawk Down.”

Prior to Sony, he was at Revolution Studios and before that he spent five years at Disney, where, as co-president of marketing in the Buena Vista Motion Pictures Group, he worked on the campaigns for films including “The Sixth Sense,” “The Insider,” “Toy Story 2” and “Remember the Titans.” He began his career at 20th Century Fox in the ’80s.

Ammer was lauded for his efforts, drawing an Advertising Age nod as entertainment marketer of the year in 2003.

He’s survived by his wife Mia; a son and a daughter; and two sisters.