As the former chief executive of Fair Isaac Corp., Larry E. Rosenberger knows a thing or two about credit risk. Now he's taking one, by extending a $500,000 loan to the cash-strapped Tamalpais Bancorp.

The San Rafael, Calif., company, where Rosenberger is a director, is in technical default on two other loans totaling $6 million. If Tamalpais doesn't remedy the situation, its lender could foreclose on the collateral: the company's $703 million-asset bank.

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