Ernst Homburg has been appointed member of merit at the Koninklijke Nederlandse Chemische Vereniging (KNCV; Royal Netherlands Chemical Society). He has been member of the KNCV since 1974.
From the moment the Chemie Historische Groep (Chemical History Group) was formally established in 1999, Ernst has been involved in this group as board member. From 1999 until 2009, he was chairman, from 2009 until 2018 he was secretary, and since 2018 he has been both chairman and secretary.