Blake McIver Ewing (born March 27, 1985), also known as Blake McIver and Blake Ewing, is an American singer-songwriter, actor, model and pianist. He was known for playing Michelle's friend, Derek, on the sitcom Full House a role he reenacted on Fuller House and played the role of Waldo in the 1994 feature film version of The Little Rascals.
For Nickelodeon, he and voiced Eugene Horowitz on Hey Arnold! during its fifth season (replacing Ben Diskin, Jarrett Lennon and Christopher Castile).