Matthew Gray Gubler is only weeks into filming his new CBS show, Einstein, but he's already trying to get some of his former Criminal Minds costars to make cameos. "There's only one person I went on from Criminal Minds and it's every single one," Gubler, 46, exclusively told Us Weekly at CBS Fest on Wednesday, April 15. "I feel lucky to be back on the tiny little TV screen again and I hope they'll all come back." He continued: "I've already reached out to all of them.