Gemma Postlethwaite is Chief Executive Officer of GLG, the global insight network trusted by leading decision makers.

Prior to joining GLG in July 2023, Gemma served as CEO of Arizent, a business information company providing specialist content for the financial and professional services industries and unique B2B marketing solutions for some of the world’s leading technology and consulting brands. She led Arizent’s transformation from a media and publishing company to a tech-enabled platform solution leveraging the company’s extensive first-party data. Previously, Gemma served as CEO of PIRA Energy Group, where she established PIRA as a leading integrated, research, and data provider to the global energy markets. In 2016, Gemma led the sale of PIRA Energy Group to S&P Global.

Prior to PIRA Energy Group, Gemma was SVP, Strategy and Operations at Altegrity, a global provider of risk and compliance solutions; and Chief Product Officer and President of Infogroup’s SMB business unit. She also spent eight years in senior positions at Thomson Reuters in product and data, global investment banking and private equity, and commercial strategy.

Additionally, Gemma is a Member of the Supervisory Board at TomTom and proudly serves on the New York Board of the All Stars Project whose mission is to transform the lives of youth and poor communities using the developmental power of performance, in partnership with caring adults.

She is a graduate of the University of Kent.