Seán Dineen, Professor of Mathematics at University College Dublin from 1979 until his retirement in 2009, passed away on the 18th of January 2024. Se´an was a member of the Royal Irish Academy, a Head of Department and Head of School at UCD and a founding member and former president of the Irish Mathematical Society. He was a renowned expert in infinite dimensional holomorphy and leaves behind a canon of work, including scholarly papers, research monographs and undergraduate textbooks.
