Donald S. Parker

Celeren Corp. provides electric utility outsourcing services. It serves hotels and resorts, commercial offices, hospitality, food service, senior related, industrial, and medical facilities markets. The company was founded by Thomas A. Brigger and Donald S. Parker in 2001 and is headquartered in Bala Cynwyd, PA.

Biosystems, Inc. manufactures gas detectors and respiratory maintenance equipment. It offers fixed-point equipment & accessories used in gas detection, air purification, respirator maintenance and other types of hazardous environment monitoring. Biosystems specific brand names include MultiPro (four channel gas detector), Toxi Pro (single sensor gas detector), PosiChek (ventilation systems), Touch 'N Track (firefighter identification systems), Travelpanel and Airpanel (portable air purification systems). The company was founded by Jack Burt in 1981 and is headquartred in Middletown, CT.

Part of Enron Dissolution Corp., Enron Energy Services Operations, Inc. gathers, transports, and markets natural gas. The company is based in Houston, TX.

Jacobs Engineering Group, Inc. engages in the provision of a diverse range of technical, professional, and construction services to industrial, commercial, and governmental clients. The firm operates through Critical Mission Solutions, and People & Places Solutions segments. The Critical Mission Solutions provides a full spectrum of cyber, data analytics, systems and software application integration and consulting services. The People & Places Solutions provides end-to-end solutions for clients' complex challenges like whether climate change, energy transition, connected mobility, integrated water management, smart cities or vaccine manufacturing. The company was founded by Joseph J. Jacobs in 1947 and is headquartered in Dallas, TX.

Biosystems, Inc. manufactures gas detectors and respiratory maintenance equipment. It offers fixed-point equipment & accessories used in gas detection, air purification, respirator maintenance and other types of hazardous environment monitoring. Biosystems specific brand names include MultiPro (four channel gas detector), Toxi Pro (single sensor gas detector), PosiChek (ventilation systems), Touch 'N Track (firefighter identification systems), Travelpanel and Airpanel (portable air purification systems). The company was founded by Jack Burt in 1981 and is headquartred in Middletown, CT.