On the heels of Blackberry's tepid earnings release, vice chairman Mike Lazaridis announced that he'll leave the company on May 1st. The exec founded the company formerly known as Research in Motion almost 30 years ago, with Jim Balsillie as its early CEO -- who resigned this time last year himself and recently sold off his remaining shares. Lazaridis said that he'll focus instead on his new Quantum Valley Investments venture, which recently
