Joe Kirby is from Wimbledon, London. After completing an International Baccalaureate, he attended Warwick University where he was elected president of its student’s union. In this role, to integrate home and international students, he persuaded Archbishop Desmond Tutu to attend an event at his university. In addition, to raise funds for prostate cancer, he led a team of student volunteers on a hundred-mile walk across Britain.
He has two younger sisters, Juliet and actress Vanessa Kirby. Their mother worked for Country Living and their father is the prostate surgeon Roger Kirby.