Photo gallery: Top 25 Most Influential Women in UK IT 2014

Nicola Mendelsohn has been the vice-president of Europe, the Middle East and Africa operations at Facebook since May 2013. Mendelsohn is responsible for growing Facebook's advertising revenue and improving relationships with brands across Europe, the Middle East, Africa and Russia. She served as the president of the IPA and WACL. 

She served as an executive chairman and partner of Karmarama LLP for five years. She started her career in advertising in 1992. She serves as director of The Fragrance Foundation and is a board member of Cosmetic Executive Women. She is chair of the Corporate Board of Women's Aid. Mendelsohn holds a degree in English and drama.