Terry Davis is the sole author of TempleOS which he described as a a free, public domain, open source, x86_64, non-preemptive multi-tasking, multi-cored, ring-0-only, single-address-map (identity-mapped), non-networked, PC operating system. Davis was born December 1969 and has been diagnosed with schizophrenia since the mid-1990s. Development for TempleOS began in 2003 after Davis suffered from a series of manic episodes that left him briefly hospitalized for mental health issues. The operating system was coded in a programming language, developed by Davis in C/C++ called "HolyC". The OS runs a file system called "Red Sea".