Lt Col Anderson Gray McKendrick DSc FRSE (8 September 1876 – 30 May 1943) was a Scottish military physician and epidemiologist who pioneered the use of mathematical methods in epidemiology.

Irwin (see below) commented on the quality of his work, "Although an amateur, he was a brilliant mathematician, with a far greater insight than many professionals."

He was educated at Kelvinside Academy then trained as a doctor at the University of Glasgow qualifying MB ChB in 1900.

His proposers were James Oliver, Diarmid Noel Paton, Ralph Stockman and Cargill Gilston Knott.

His 1926 paper, 'Applications of mathematics to medical problems' was particularly impressive, including the widely used McKendrick–Von Foerster partial differential equation.

There is a photograph at There is a modern presentation of one of the Kermack–McKendrick models in McKendrick's father was elected to the Royal Society, as was Kermack his co-worker