Walt Mossberg and Kara Swisher has announced that Apple CEO Tim Cook will be the opening speaker at the 10th D: All Things Digital conference. This will be Cook’s first appearance at D. Cook is carrying on the legacy left by Steve Jobs, whom attended the D conference 6 times in the last decade. Before becoming CEO of Apple, Cook was COO and was responsible for worldwide sales and operations for the company’s supply chain. Cook also oversaw the Macintosh division. Before joining Apple, Cook worked at Compaq and spent 12 years at IBM.