Tom Phelan Is an American Actor, Model, & Youtuber He Famously Known As Reactor on Teens React and Adults React. He acted in a couple of shorts before becoming a regular on Teens React. His first appearance was in TEENS REACT TO GANGNAM STYLE. His first appearance after graduation was in ADULTS REACT TO THE VIEW-MASTER. Now, he focusing on Acting & Modeling Career, and played on Several Movies