By Sheila McNulty
Published: January 16 2008 19:22 | Last updated: January 16 2008 19:22
Susan Longacre retired from Chevron in 2002, yet five years later she still puts in up to eight weeks a year on the job. The second-biggest oil company in the US could not afford to let the 66-year-old geologist simply take her 35 years’ experience and disappear.
Chevron has only 15 to 20 people with the experience Ms Longacre has gained reading samples drawn from deep underground to determine potential volumes of hydrocarbon resources.