When John Guz was fired from Bechtel National Inc. in 1993, the financial reports supervisor had 22 years of service, six promotions and 17 pay raises under his belt.

But when Guz sued the engineering and construction firm in San Francisco Superior Court for wrongful termination and age discrimination, Judge William Cahill granted Bechtel’s summary judgment motion on the basis that Guz was an at-will employee and therefore never guaranteed permanent employment.