Mark Williams Company

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The Mark Williams Company was a small software company in Chicago, Illinois (later moved to Northbrook, Illinois) that created Coherent, one of the first Unix-like operating systems for IBM PCs and several C programming language compilers. It was founded by Robert Swartz in 1980 and discontinued operations in 1995. The name comes from the middle name of Robert Swartz's father, William Mark Swartz.

Bob Swartz moved the company (originally producing a soft drink called Dr. Enuf) into software with his father's help and the company became known as the Mark Williams Company.

AT&T had Bell Labs investigate the Mark Williams Company for infringement on their Unix clone Coherent but found no evidence that it copied Unix.

Some notable achievements:

Produced Coherent, the first commercially viable clone of Unix.
csd the world's first C source debugger.
Let's C the first low-cost professional C compiler for the IBM PC.
Mark Williams C for the Atari ST, first major C programming environment for the ST computers.