Saxby, who leaves today, was part of the management team that grew World Events to 130 people, raising its value in the build-up to its sale to United Drug in 2010.
Saxby said: "It has been an exciting three years. We have merged two businesses and created and grown Universal World Events to the point it employs over 300, is the UK’s number one and in the top 20 in Europe and the US.
"We have achieved double-digit EBIT growth since the merger, developed existing client relationships and won some fantastic new clients.
"I will be exploring various options over the next few months. I leave behind a great team at Universal World Events and I wish them all the very best for the future."
Graham McIntosh, Universal World Events’ managing director, said: "I have thoroughly enjoyed working with Mark. He has played a key part in our development and I would like to thank him for his contribution and wish him every success going forward."