Michael Patrick has been appointed vice president of Datum Inc. and president of Datum-Irvine. He had been Datum-Irvine's executive vice president of operations. Patrick joined Datum in May 1998 as vice president of operations. Before that, he was vice president of operations at Interstate Electronics Corp.
* Jon Engleking has been named chief operating officer of E-Commerce Exchange in Irvine. He had been executive vice president. Since joining the company in 1993, Engleking has also been sales manager and vice president of sales.
* Sherry Harton has joined California Utility Co. in Irvine as director of operations. She was previously acting controller of the Irvine Ranch Water District.
* Jim Walton has been appointed vice president of the newly created Corporate Development group for Nuforia, an Irvine e-business and strategic branding company. He had been with Fluor Corp. for more than 19 years, most recently as director of the strategic planning group.