Brendon was born the 12 of April of 1971 in Granada Hill, San Fernando Villay, in Los Angeles, along with its twin brother Kelly Donovan; it has in addition two smaller brothers. When their parents, Bob and Kathy, divorced, their mother became agent of theater. He attended his studies in Canyons, the locality of Santa Clarita. He decided to dedicate itself to act when a serious injury in its arm prevented him to become professional player of baseball, but had tartamudez problems. Before obtaining the paper of Xander he had thirteen works of which he was dismissed. He had begun from zero making small announcements and also worked of production assistant. To the being dismissed of this position, it found to which wanted to photograph to him, which would help him to work in series. To the twenty-five years, after to have solved its problem of tartamudez, appeared to castings of Joss Whedon to work in the series where it would occur to know, Buffy the cazavampiros. It obtained the paper of Xander Harris. Also it dedicates to his efforts to the organization "Stuttering Foundation of America"