Sarah Wright - head of Barclays Events - is leaving the firm after five and a half years.
Wright is planning to take a few months out after leaving to "explore opportunities", she said.
"I am really sorry to be leaving Barclays and the team and am grateful for the exceptional opportunities that have been afforded to me during my time with them," said Wright.
"After five years, however, I am now ready for my next challenge and have decided to take a few months out to explore the numerous opportunities that exist, as well as have a bit of a rest.
"I am phenomenally passionate about the industry, training and development across the board and moving the professionalisation of the industry agenda forward and will continue to support the great work that is already going on in the various associations.
Barclays is now looking for a replacement for Wright, who took seventh place in last year's C&IT Power 50. For more information about the vacancy, contact firstname.lastname@example.org.
Wright added: "I feel the time has come to draw on the breadth of agency and corporate, sales and operations experience that I have been lucky enough to have gained in differing industries over the years to lay out the next stage of my career at this exciting time in the events arena."
Barclays corporate affairs director Tim Kiy said: "Sarah has achieved many accolades in her five and a half year career at Barclays including Eventia Events Team of the Year, Best Conference, Barclays Woman of the Year and a Chairman's award for her team's work with the charity sector. While we are sad to see her go we wish her every success in her new ventures and thank her for all she has achieved for Barclays and the team. "