Mark works at Cintas, a company that makes uniforms.

He is remarkably open-minded about exceptions to his daily routine, as long as an environment of constancy is available. Here, the Sherretts are attending a cousin's open house; the hubbub overwhelmed Mark, and he sensibly sought relief by locating a couch downstairs.

Similarly, Mark often travels with his mother; the shock to his routine is negated by using a Jacuzzi and pool at each host hotel.