Gilhooly had worked on events and concerts at
Harrogate International Centre and at the
ExCel Centre in London's
Docklands. In 2000, he became executive director of Wigmore Hall, with responsibility for general administration separate from its then-Artistic Director,
William Lyne. In 2005, Gilhooly became artistic director of Wigmore Hall in addition to the post of executive director, at age 32 he was then the youngest head of a classical concert venue worldwide. He has also chaired the biennial Wigmore Hall/Independent Opera International Song Competition and the Wigmore Hall String Quartet Competition. In June 2020, under Gilhooly's leadership, Wigmore Hall was the first UK classical music venue to present a live series of streamed chamber music concerts under quarantine conditions in the wake of the COVID-19 pandemic. Gilhooly became chairman of the Royal Philharmonic Society in 2010. He was also Patron of the refurbishment of Corpus Christi Roman Catholic Church, Covent Garden. He is a trustee of the International Musicians’ Seminar, Cornwall, a trustee of The
Susan Chilcott Scholarship and an advisor to
London Music Masters. He is Patron of Wimbledon Music Festival and a freeman of the
Worshipful Company of Musicians. He has held advisory roles with
Cheltenham Music Festival and the Dartington Trust. He is a former director of the British Association of Concert Halls. ==Awards and honours==