Markey was born in 1918 in Belfast and studied there at the College of Art. While his main passion was painting he also made sculptures, and designed some stained glass panels. His first exhibition was also held in Belfast during World War II. He held annual one man shows in the Oriel Gallery from 1976 until his death. He showed a number of pictures at The Royal Hibernian Academy and he had a one man show at the George Gallery and the Leinster Gallery.
Markey is a house hold name and he depicts the West of Ireland with emotion and energy with his simplistic images and limited palette. His paintings cover a wide range of subjects from landscapes to still life to circus clowns and figurative pieces. He is represented in IMMA and the Ulster Museum and he is in many private collections across the globe.
Markey painted right up to his death in 1999