The one on the right is Mario the chef from the Food Network. I’ll not use any of his recipes again. No clue on the two other guys in the picture.
That is Elton Brown. I don’t care what political views he has, he had a fantastic show called Good Eats on Food Network. Cooking show with goofy skits and characters and going in the specific scientific details of cooking. Very, very, quirky show. He does other hosting gigs currently, American Iron Chef is (was?) one.
Thanks!