Mark Jeffery (B. 1973, UK) is a performance artist, choreographer, collaborator, and curator. He is Chair of The Performance Department and Full Professor at The School of the Art Institute of Chicago. Since 1994 Mark has developed unconventional collaborations with visual artists, video artists, sound artists, code artists, dancers, and cows.

Since 2020 he has collaborated with Lucy Cash on their film and installation project Winterage: Last Milk.

In 2012, he co-founded the language, performance, and technology collective Anatomical Theatres of Mixed Reality (ATOM-r). ATOM-r premiered its first work The Operature in 2014 at the National Museum of Health and Science, Chicago. In 2017 ATOM-r premiered Kjell Theøry at The Graham Foundation Chicago. In 2018, ATOM-r presented Rhinestone Cowboy, performed with cows at 606, Chicago. ATOM-r presented I Love The Dead at Gallery 400, Chicago in February 2023.

Since Summer 2019 Mark has collaborated with Kelly Kaczynski  on a residency  project at The Poor Farm, Wisconsin and since 2023 NIDO LIVING IN THE PLAY, Monte Castello di Vibio, Italy.

Mark was a former member of the internationally renowned Goat Island Performance Group from 1996 - 2009. Goat Island toured and taught extensively across North America and Europe. In 2019, The Chicago Cultural Center presented an exhibition dedicated to the work of Goat Island.