Oceanographer Robert Ballard Leaving Mystic After 15 Years

World-renowned oceanographer Robert Ballard has ended his 15-year relationship with Mystic Aquarium, which exhibited his discoveries of wrecks including John F. Kennedy's PT-109 and the Titanic.

Ballard said on Monday that his work with his Ocean Exploration Trust and the Center for Ocean Exploration at the University of Rhode Island are taking up much of his time.

According to the Day of New London, Ballard, 72, said he had "a great run" at the aquarium.

He began at the aquarium in 2000 and helped it obtain state funding for a major expansion and renovation. Ballard agreed to stay for 10 years.

Aquarium President Stephen Coan said Ballard's departure is bittersweet after working closely with him for 20 years. He said the aquarium will continue to feature Ballard's exhibits and expeditions.