Johnson Controls is one of the leading manufacturers of automotive, power and mechanical systems. The company was founded in 1885 by Warren Seymour Johnson, inventor of the electric room thermostat. It provides seating, overhead, door, storage and electronics systems for passenger cars and light trucks. The company also offers a variety of mechanical equipment and systems that control heating, ventilating, air conditioning, lighting and security in buildings. Headquartered in Milwaukee, Johnson Controls has more than 100,000 employees worldwide and is one of the largest manufacturers of lead acid automotive batteries. The company also provides integrated facility management services. It maintains an office in Lynnfield, Mass.