George Leslie Mackay or Má-kai; (21 March 1844 - 2 June 1901, aged 57) was the first Presbyterian missionary to northern Taiwan (then Formosa). He dedicated his life to bringing medical, dental, and spiritual guidance to the people of Taiwan, He was directly responsible for establishing more than 60 local churches, Oxford College (Aletheia University), the first girls' school (Tamsui Girls' School, 1884) and Tamsui Middle School (Tamkang Senior High School). A key achievement was the establishment of what is now called the MacKay Memorial Hospital in 1880 bringing Western Medicine to Taiwan. He helped to adapt the Taiwanese language to a written form by adapting the Latin alphabet to represent it phonetically. It is safe to say that he is the most famous and beloved foreign expat who has lived in Taiwan.