Sun Microsystems chief researcher John Gage will leave the company and join venture capital firm Kleiner Perkins. Gage, who joined Sun in 1982, will focus on "green" investments. Meanwhile, Sun wilts. After corporate clients slowed their tech infrastructure investments, Sun reported second quarter losses and Gage is the second top executive to leave the company in the last two weeks. Rival Hewlett-Packard poached Sun's top salesman Don Grantham. Sun says as many as another 2,500 could follow the pair out the door, though executive suites HP and Kleiner Perkins do not await them all.