Christopher Dietzler has joined Science Applications International Corp. (SAIC), McLean, Va., as a senior vice president. The change follows its May 17 acquisition of Patrick Energy Services Inc. (PES), Lisle, Ill., where he was president. That firm was a unit of Patrick Engineering, also in Lisle, which ranks at No. 191 on ENR's list of the Top 500 Design Firms. It became a stand-alone firm in 2007. Dietzler also was a vice president of the parent firm. PES, now part of SAIC's Energy, Environment & Infrastructure LLC subsidiary, provides energy, smart-grid, and transmission and distribution engineering. About 200 PES employees will join SAIC. PES had 2010 revenue of $21 million. SAIC reports corporate revenue of $11 billion for the year ending Jan. 31 but did not disclose specific revenue for its energy, environment and infrastructure unit.

AHBE Landscape Architects, Culver City, Calif., has hired Hongjoo Kim as a design principal. Most recently, he was principal at architect Mia Lehrer + Associates.