John Gregory, a.k.a. John Gregorie, was an eighteenth-century Scottish Enlightenment physician, medical writer and moralist.
John Gregory
Portrait of Dr John Gregory, painted by George Chalmers.
James Gregory (mathematician)
James Gregory was a Scottish mathematician and astronomer. His surname is sometimes spelt as Gregorie, the original Scottish spelling. He described an early practical design for the reflecting telescope – the Gregorian telescope – and made advances in trigonometry, discovering infinite series representations for several trigonometric functions.
James Gregory (1638–1675)
Vera circuli et hyperbolae quadratura, 1667