Extra Hat for Unit’s CEO Doyle

Unit Instruments Inc. named president and chief executive Michael J. Doyle to the additional position of chairman.

Doyle replaces James C. Levinson, who retired. The company named Donald M. Spero director, filling the vacant board seat. Spero is principal of Spero Quality Strategies, Bethesda, Md., which provides investment and advisory services.

Unit Instruments also said that after considering a number of alternatives, it has decided to focus on expanding its existing business, making mass flow controllers and gas-delivery systems for the semiconductor and industrial markets.