Mr. Diarmaid Cunningham is Chief Administrative Officer, General Counsel, Executive Vice President and Company Secretary. 

Mr. Cunningham joined the Company as General Counsel in November 2009.  From 2009 until 2013, Mr. Cunningham was based in the Company’s global headquarters in Dublin.  In 2013, Mr. Cunningham was seconded to the Company’s US headquarters in Pennsylvania and that secondment ended in 2018 when Mr. Cunningham returned to Dublin.

In July 2016, Mr. Cunningham’s role expanded to include Chief Administrative Officer in addition to General Counsel which added responsibility for the Company’s Quality Assurance, Client Contracts Services, Facilities and Procurement groups in addition to his responsibility for the Company’s Legal group. In 2023, Symphony Health (ICON's data business) moved to report to Mr. Cunningham and was also added to his group. 

Mr. Cunningham graduated with a Bachelor of Business and Legal Studies from University College Dublin in 1997, qualified as a lawyer in 2001 and completed the Stanford Executive Program at Stanford University in California in 2015.  Mr. Cunningham served as Secretary to the Board of the Association of Clinical Research Organizations (ACRO) in 2013 and 2014 and 2020 and has been appointed again for 2021. ACRO represents the CRO industry globally to key stakeholders including pharmaceutical, biotech and medical device companies, regulators, legislators and patient groups.

Prior to joining the Company, Mr. Cunningham spent 10 years with A&L Goodbody, one of Ireland's premier corporate law firms.

In January 2021, Mr. Cunningham was appointed as a non-executive director of the Irish charity The Jack & Jill Foundation.

Mr. Simon Holmes leads ICON’s Corporate Investment and Partnerships group which has responsibility for capital allocation into M&A, equity investments and innovation partnerships. During his time at ICON Simon has led the acquisition of over 24 companies including the $12bn acquisition of PRA Health Sciences. A member of ICON’s leadership team since 2009 he is also involved in strategy development and business planning. Mr. Holmes joined ICON in 2005 originally as VP of Marketing and Market Development and took responsibility for Corporate Development in 2006. Between 2013 and 2017 he also had responsibility for ICON’s Investor Relations functions. Prior to joining ICON, Mr. Holmes held a number of senior roles within “Blue Chip” organisations in the IT Services and Telecommunications sectors, including Cable and Wireless, Logica and Microsoft. Mr. Holmes has an MBA from Smurfit Business school and is a graduate of Cambridge University and the University of East Anglia.