O’Callaghan leaves education group

BARRY O’CALLAGHAN, the former investment banker, has resigned as chief executive of global education firm, Houghton Mifflin Harcourt.

In January last year, the group was forced to renegotiated its €5 billion debt, but Mr O’Callaghan, who had built up the company out of publishing house Riverdeep, held on to his job at the time.

Irish investors are estimated to have lost up to €500 million in the restructuring.