Cats Software, Palo Alto, Calif., said Robert A. Lopez, a former sales executive for company, has rejoined it as director of North America sales, a newly created post.

Cats provivdes technology solutions for derivatives finance and companywide risk management.

Joshua Sommer, an expert in risk management systems and finance, has joined the firm as a senior financial engineer. As a member of Cats financial architecture team, he will assist in defining a systems and financial framework for next-generation derivatives and firmwide risk management products.

Mr. Sommer was founder, president, and chief executive of International Risk Control Inc., Palo Alto, Calif.. The company provides technology to support corporate treasurers in value-at-risk calculations, as well as selling commodity risk management systems to the gold industry.

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