Kirby Howell-Baptiste was born and raised in London, England. Kirby was first enrolled in acting classes at the Anna Scher Theatre at the age of 12.
Upon leaving secondary school, Kirby starred in 'Echoic', a devised West End play with the Talawa Theatre Company, Britain's foremost Black-led Theatre company. Kirby's passion then led her to study acting at the East 15 Acting School, and then to Los Angeles, to study at the Lee Strasberg Theatre and Film Institute.
Kirby performs regularly at The Upright Citizens Brigade Theatre, LA.