Marc Samwer, who headed Groupon's international operations and owns part of the company along with his brother Oliver, leaves during a torrid month for the company.

Google Ventures takes on high ranking Google statistician to strengthen its quantitative team.

Edgar Hardless reportedly steps up to take over the running of the corporate venturing unit from Yvonne Kwek, who was its founding chief executive in 2010. She is now retiring.

Brown said he would be a consulting employee on some matters for a quarter or two and that SAIC would continue to "very sparingly" use its corporate venturing tool.

Crowe has spent 18 months as head of operations at MIH Europe after two and a half years as head of mergers and acquisitions for the group and Naspers in Europe.

Cooper was also a co-founder of Boost Mobile USA and founding partner of the Softbank Capital Technology Fund set up by Japan-based internet conglomerate Softbank.

Previously, Gray was chief executive of Nura, a privately held biotechnology company acquired by Omeros in 2006.

Repeat entrepreneur Dionne joins the molecular therapeutics company, backed by Genentech and GlaxoSmithKline's corporate venturing unit, which was founded by three academics in the field of epigenetics.

Dmitry Alimov, formerly a partner at Russia-based technology company Ru-Net, launches his own firm.

She formerly managed private equity firm 3i's relationships with senior executives and non-executives across a range of sectors and geographies.