Malcolm was educated at Blackheath Propriety School, and privately abroad, and carried out his medical studies at Guy's Hospital, London, entering in 1899. He passed the second Conjoint in January 1903, and the Final in April 1907. He dressed to Mr Golding-Bird, and was Clinical to Dr Hale White and Dr Pitt in the last three months of 1907. After obtaining his medical qualifications he joined the Medical Services, entering in January 1908, and gained a commission of Lieutenant from the 4th February. On 4th August 1911, he was promoted to Captain. Malcolm was serving with the Egyptian Army when war was declared (1st February 1910 - February 1914, and had served in Upper Egypt, the Soudan, and in an expedition up the Blue Nile. He was immediately brought back and attached as Medical Officer to the 1st Northumberland Fusiliers. He was appointed to the Distinguished Service Order "For gallant conduct and exceptional devotion to duty in attending to wounded at Frameries, where he was himself wounded." His wounds were caused by shrapnel and he died from the effects of these wounds the same day. The Guy's Hospital Gazette, 2nd January 1915, wrote: "During some three years in the Dissecting Room I got to know him well, and chiefly remember his keenness for everything he undertook; he was one of the first to take up hockey at Guy's and to establish it as a regular Hospital game. He was typical of that fortunately common stamp of Conjoint man who makes public opinion among his fellows, and is respected and liked for himself and his manliness; I should say that Leckie spent himself for his friends, and recently taking over with one of his chums or recollections of him. we agreed that he was happiest when taking immense pains to do some small kindness to others often for those who had but slight claim on his friendship. To those who knew him well he was always the same kind, generous, unselfish person, with rather a thoughtful manner and slow to express his own views; one can well imagine that his place in his Mess will remain unfilled, and many a sick or wounded soldier will know he has lost a friend." Malcolm was the youngest surviving son of James Blyth Leckie and Selina Leckie (daughter of Robert Bousfield) of Monkstown, Crowborough, Sussex, and Peebles, formerly of Blackheath, co. Kent. The family claimed its descent from the Leckie of the Barony of Leckie of Stirlingshire, which was created in 1352. Probably the most famous Leckie was Sir Walter, who, during the 100 Years War became the bodyguard of King Charles V11 of France and commanded the victorious Scottish troops at the Battle of Lagny on the 10th August 1432. He was the brother-in-law of Conan Doyle.