Robert Ballard is an American oceanographer and explorer best known for his discovery of the wreck of the Titanic in 1985. He has dedicated his career to studying the ocean and its mysteries, using advanced technology to explore underwater environments. In addition to the Titanic, Ballard has explored other significant shipwrecks, including the Bismarck and the USS Yorktown. He has also worked on various research projects related to marine biology and geology, contributing to our understanding of ocean ecosystems and underwater archaeology.