Robert Schiller

ISS Facilities Services, Inc. provides janitorial, mechanical, landscape, and security services. The firm offers services to the commercial office buildings, schools and universities, historic properties, medical facilities, retail chains, stadiums, theaters, convention centers, and high-profile events. The company was founded by Darrell Glover in 1978 and is headquartered in San Antonio, TX.

Sanitors, Inc. provides janitorial and retail cleaning services. The company offers janitorial, mechanical, landscape and security services of the highest quality for commercial office buildings, schools and universities, historic properties, medical facilities, retail chains, stadiums, theaters, convention centers and high-profile events such as golf and tennis tournaments. Sanitors was founded in 1978 by Darrell Glover and is headquartered in San Antonio, TX.