Hennessy, Hennessy & Co Commercial organisation Architectural practice founded by Jack Hennessy and his son. Milestone Formed 1912 {"name":"Formed","target":"","target_text":null,"date":{"#markup":"<span class='date'>1912<\/span>"},"date_start":"1912","date_end":"1912"} Incorporated Sheerin & Hennessy 1912 {"name":"Merged into","target":"Sheerin & Hennessy","target_text":null,"date":{"#markup":"<span class='date'>1912<\/span>"},"date_start":"1912","date_end":"1912"} Position Architect St Mary's Cathedral 1900 - 1928 {"name":"Architect","target":"St Mary's Cathedral","target_text":null,"date":{"#markup":"<span class='date'>1900<\/span><span class='separator'> - <\/span><span class='date'>1928<\/span>"},"date_start":"1900","date_end":"1928"} Property Owned by Hennessy, John Francis (Jack) 1912 - 1923 {"name":"Owner of","target":"Hennessy, John Francis (Jack)","target_text":null,"date":{"#markup":"<span class='date'>1912<\/span><span class='separator'> - <\/span><span class='date'>1923<\/span>"},"date_start":"1912","date_end":"1923"} Type Commercial organisation {"name":"Commercial organisation","target":"","target_text":null,"date":{"#markup":"<span class='date'><\/span>"},"date_start":null,"date_end":null}