Colonel William Ivison Macadam VD FRSE FSA FIC FCS FRSSA (27 January 1856 – 24 June 1902) Colonel Professor W. Ivison Macadam was a prominent Scottish scientist (analytical chemist), academic author and antiquarian. He was also Colonel of the 1st Lothian Volunteer Infantry Brigade and a leading Freemason. He was generally known by his middle name Ivison. On 24 June 1902, aged forty-six, he was shot and killed, along with a student, by a mentally disturbed gunman in his own laboratory at Surgeons Hall, Edinburgh.