Born in London, Kosminsky attended Oxford University as a chemistry
major. He spent much of his time at the university in theater, where he
was a lighting designer for the Dramatic Society and where he
ultimately produced a successful touring production of Twelfth Night,
co-starring fellow student
Hugh Grant. The production's composer and accompanist was another young student named
Rachel Portman. Following school, he worked at the BBC as a graduate trainee before becoming a
documentary director.
Kosminsky, his wife Helen and two daughters, reside in Wiltshire,
England."