WPP after 33 years, following allegations of personal misconduct and misuse of company assets. Sorrell has denied the allegations. The Financial Times in an investigation around the circumstances of his departure from WPP has commented that what “emerged is a picture of routine verbal abuse of underlings and a blending of Sir Martin’s corporate and private life that jarred with some colleagues — particularly over his company expenditure, some of which was also extended to his wife” This included allegations that Sorrell visited a brothel paid for with company funds. Sorrell has denied these allegations. As of April 2021, WPP and Martin Sorrell remain entangled in a legal battle over a disputed payout over allegedly leaked information to media following Martin Sorrell's resignation. S4 Capital In May 2018, Sorrell acquired Derriston Capital, a cash shell listed on the London Stock Exchange, with plans to create a marketing company called S4 Capital. Sorrell invested $53 million of his money, and raised $15 million more from investors. In July 2018, S4 Capital purchased MediaMonks for $350 million, using a share issue to fund the purchase. Sorrell's previous employer, WPP, claimed that he was using confidential information by pursuing the deal. In December 2018, S4 Capital purchased MightyHive for $150 million. In June 2019, S4 Capital acquired the Melbourne company BizTech. By this point, the company had 1,300 employees, including a number of ex-WPP employees. In October 2019, MightyHive announced that it was merging with ConversionWorks, a company which works with Boots, Diageo and Giffgaff. Other mergers include TheoremOne, and XX Artists, both in 2022. Other interests In 1997, he was appointed an ambassador for British business by the Foreign and Commonwealth Office and subsequently appointed to the Office's Panel 2000 aimed at rebranding Britain abroad. In 1999 he was appointed by the secretary of state for education and employment to serve on the Council for Excellence in Management and Leadership. He is a governor of London Business School, and a member of the advisory boards of both the Judge Business School in Cambridge, UK and IESE in Spain. He is also chairman of the Global Advisory Board of the Centre for International Business and Management (CIBAM), at the University of Cambridge, UK. In 1998, he was appointed to the board of directors of associates of Harvard Business School and to the board of the Indian School of Business. On behalf of New