From the Guardian website:

Born to Irish parents, Angela (nee McGrath) and Tom Hayes, in Toronto, where his father, a chartered engineer, was then working, Mark was educated at Stonyhurst college in Lancashire. I met him at Cambridge, where he read economics at Clare College and laid the foundation for his guiding thought, which was to create new models for trading. From Cambridge, he joined 3i, Europe’s largest venture capital organisation, and was running the Melbourne office before he was 30.

Read the full obituary on the Guardian site