In his new role Berg, who will remain a non-executive director and board advisor to FMG Group, will be responsible for driving the worldwide growth of the Ceros platform.

Meanwhile, Ceros co-founder and former chief executive Paul Fifield has been named president of the business.

The move follows the $20m (£12.5m) sale of the former family-owned FMG Group to a group of private equity investors led by India Value Fund Advisors (IVFA) in March 2011.

Following the sale, IVFA appointed a new US-based group chief executive in Dilip Keshu, former group chief customer officer of the FTSE-listed BPO business Xchanging, responsible for overseeing FMG's global operations in New York, London, Bangalore and Chennai.

In an internal communication to staff, Berg hailed FMG's success in securing major new investment in 2011 and its expansion into the US with the opening of its New York office.

He added: "With its new financial backing, 2012 will  be an exciting year for FMG. It will bring new opportunities, new challenges and undoubtedly it will bring the chance for FMG to demonstrate - once again - that inherent ability to adapt to change and grow as a result. One such change affects me directly.

"As of January 2012 I will be leaving my day-to-day role at FMG to take on a new role as CEO of a company close to FMG's heart and with whom FMG has a significant stake: Ceros.

"Ceros was spun out of FMG this year under Paul Fifield and he and the team have done an amazing job of laying the foundations of a fantastic marketing platform and business that can grow and scale globally at the same pace as FMG. My new job will be to join the team in order to help make that happen."