Head of Rugby Operations at the club from 2005, Simon joined the Board of directors in September 2011 in the new position of Acting Chief Operating Officer.
Previously a sports lawyer and partner at James Chapman & Co in Manchester, Simon represented the England rugby team, Rugby Players Association and British & Irish Lions players. He also set up Rugby Class, a nationwide rugby coaching company, and operated as an agent for a number of England players including Jonny Wilkinson before joining Leicester.
Peter Tom CBE, Leicester Tigers Executive Chairman, said: "Simon has a huge amount of experience in the game of rugby, dealing with the financial side of the business as well as working closely with the coaching and management teams and the players.
"His appointment to the role of Chief Executive reflects his wealth of knowledge as well as his commitment and determination to drive Leicester Tigers forward in the future.
"We are delighted to confirm Simon’s appointment in this new role and look forward to his contribution in the continuing development of the club."
Cohen said: "Leicester Tigers is a great rugby club with an exceptional record of growth and success over many years.
"The world of sport is constantly changing and to be involved right at the heart of that is one of the great attractions of this environment.
“Leicester Tigers has always been at the forefront of the game and that is where we aim to stay.
“I look forward to operating in my new role at the club and hope we can all work together to drive the future success of the team and the business."