He is a director of an iPad App start up in Manhattan, called Zuse - a multitasking browser, and he is also chairman of Instant Impact, based in London.

Mitchell formed and chaired the eLearning Foundation (which provides laptops for disadvantaged children); He founded an initiative called Making Connections which enables Israeli and British academics to collaborate on scientific research projects; He chaired the Coexistence Trust whose mission it was to encourage dialogue between Muslim and Jewish students on UK campuses.

He pointed to his five-year chairmanship of The Coexistence Trust, which aims to build bridges between Jewish and Muslim students "to deal with the twin evils of antisemitism and Islamophobia on UK campuses", but commented that it was becoming acceptable for Labour affiliated students to use antisemitic epithets without the party doing anything about it.

He had previously said he would leave Labour if Corbyn was re-elected and, after the result was announced, said: "I’m a man of my word".

[5] According to Lord Mitchell on the BBC's Sunday Politics programme, Corbyn "surrounds himself with a coterie of people who hold violent, violent anti-Israel views and allied with it they are very hostile to Jews so, in my view, they’re pretty bad guys".