Born on May 27, 1976 in Cape Dorset, Markoosie's mother Komajuk Tunnillie and grandmother Tayara Tunnillie are also carvers. His grandfather was the well known artist Kububuwa Tunnillie.
Markoosie began carving around the age of fifteen. He is a prolific artist, and often carves small scale sculpture. He depicts a variety of subject matter with exquisite detail, and especially likes to depict animals in his work.