 Due to his limited playing time with George Washington, he transferred in 2014, to American University.During his first season with the American Eagles, he averaged 7.1 points, 2.3 rebounds, and 0.9 assists per game.At the end of his junior season, Maragkos rejected an offer from the Greek 2nd Division club Kavala, in order to continue his playing spell in college basketball with American University.