System Sciences Group

Illumination design for your special needs - for your product, your schedule and your budget.                  

Phone: +1 415 586 3818    Email:

About us

SSG, System Sciences Group, is a sole proprietorship consulting company operated for the last 23 years by Helen Gourley. We call on other specialists as needed for particular jobs - hence "Group." The permanent participants are Helen Gourley and Darrell Mathis, both profiled below.  

Helen Vögele Gourley

Helen Vögele Gourley is a graduate of the University of Rochester in Physics and Optics. After years of industry work as a system engineer in radiation physics, electro-optical design, and aerospace, Ms. Gourley founded System Sciences Group in 1991 to provide optical design for the expanding semiconductor and instrument companies in Silicon Valley.

She collaborated with Dr Darrell Mathis to develop the first PC-based ray trace program for non-sequential ray tracing. During the past 23 years, she has become a well-known expert in radiant system design, applying her customized software and her experience of semiconductor equipment, medical devices, and even TV and movie special effects. Among her clients are large U.S. companies such as Applied Materials, Xerox Research, General Electric Space Center, and the Naval Research Laboratory, as well as many small U.S. companies. International clients include the Royal Institute of Technology in Sweden, CSRA in Switzerland, and Aldermaston Weapons Establishment in England.

Ms. Gourley is an active member of many industry societies, and active in promoting science education. She is listed in Who's Who of American Women and in Marquis Who’s Who. More data on her work experience and current activity is available on LinkedIn.

Dr. Darrell Mathis

Dr. Darrell Mathis developed the custom software program, TRACE, that SSG uses in Illumination design. He regularly upgrades or expands that software to solve new problems.

On receiving his PhD degree from the University of Illinois, he was recruited by USC as Assistant Professor. The opportunity to solve practical problems attracted him to industry, where he first served as senior staff for Xerox Corporate Research. He is now an international expert in digital mapping and navigation.

Contact Us Today! Call 415-586-3818 or send an e-mail to have a confidential discussion about your optical design project. SSG can immediately send you a non-disclosure agreement guaranteeing that the project, including any data you send us, remains entirely secure.