The George Washington University’s most recognizable basketball player of the last four years, Pops Mensah-Bonsu, signed a two-year contract with the Dallas Mavericks yesterday. Known for his thunderous dunks and an affable personality, “The Mayor” played in the Las Vegas and Salt Lake City summer leagues. Though he was not initially expected to make the Mavericks’ deep roster, Pops’ play impressed team president Donnie Nelson enough that he cited Pops as “the most athletic…