Jesse Gordon Spencer (born 12 February 1979) is an Australian actor and musician. He is best known for his roles as Billy Kennedy on the Australian soap opera Neighbours (1994–2000, 2005), Dr. Robert Chase on the American medical drama House (2004–2012) and Lieutenant/Captain Matthew Casey on the American drama Chicago Fire (2012–present).
Spencer was born in Melbourne on February 12, 1979. He was born to Rodney Spencer, a doctor, and Robyn Spencer. He is one of four siblings. Spencer has two older brothers: Tarney Spencer, an oculoplastic surgeon, and Luke Spencer, an orthopaedic surgeon. His younger sister, Polly Spencer, is an anaesthetist. Growing up, he attended Canterbury Primary School, Malvern Central School, and the private Scotch College. While there, he auditioned for the long-running soap opera Neighbours. He completed his VCE and had gained a place at Monash University but deferred to pursue acting.