When James Findlater opened Mortlach in 1823, the output was about fifty gallons of whisky per week — modest by any standard. The whisky was generally sold direct from the still in 9 or 10 gallon casks to the well-to-do local gentry who could afford it, at about nine shillings per gallon duty paid. There were few real roads. Delivery was by pack pony over rough hill tracks, which is to say that Mortlach was a cottage industry serving a clientele within riding distance. The contrast with the modern industrial scale of Diageo, the distillery's current owner, is almost comical. What was once 50 gallons a week is now production capacity for one of the world's largest spirits portfolios.

George Cowie bought sole ownership of Mortlach in 1867. By the next year, the Elgin Courant could report that Mortlach had as many private customers as any distillery in Scotland, sending whisky to families across the three kingdoms — England, Scotland, Ireland — and out to America, India, China, and Australia, where customers preferred Cowie's distillation to all others. The trade had outgrown the pack ponies. The railway helped. So did the global reach of late-Victorian commerce. When Cowie's son Alexander returned from a medical career — University of Aberdeen, then Vienna, then Hong Kong — to take control in 1896 after his father fell ill, he found a distillery that needed expansion and got it: working with the great Speyside distillery architect Charles C. Doig in 1897, Alexander rebuilt the place around the 2.81 distillation process that defines Mortlach whisky to this day.

Most Scotch single malts are distilled twice. Some Lowland and Irish whiskies are distilled three times. Mortlach is distilled, on paper, 2.81 times. The math comes from a complicated system where different stills in the distillery's six-still set-up perform different fractions of the distillation, with some spirit cycling through certain stills more than once. The result is a remarkably rich, meaty, sulphury character — heavier and more savoury than typical Speyside whisky. The whisky was for many decades essentially invisible to consumers, used as a key component in Johnnie Walker blends. In 2014 Diageo finally launched four luxury single malts under the Mortlach name. In 2023, a Gordon and MacPhail Connoisseurs Choice 31 Year Old made by Mortlach in 1989 won Whisky of the Year at the International Whisky Competition. The Beast of Dufftown was finally getting credit in public.

Alexander Mitchell Cowie was born in 1861. He graduated in medicine from Aberdeen, then went abroad — Vienna for further training, Hong Kong for practice. When word came in 1896 that his father George was ill, Alexander came home and took over the distillery. He brought engineering ambition to the work. The 2.81 distillation, the electrical lighting installed in 1898 (among the first in the area), the new Strathspey railway siding linking the distillery directly to Dufftown — all of these were Alexander's modernisations. He became chairman of the North of Scotland Malt Distillers Association. The man who could have spent his life as a doctor in colonial Hong Kong instead spent it as a master of a single malt distillery in the Speyside hills. Both careers required precision. He picked the one that smelled better.