Personnel, promotions and changes

Armand J. Visioli Jr. has been appointed ASCO Worldwide Switch president for Automatic Switch Co.

John J. Halloran has been appointed COO of DB Riley Consolidated Inc., a unit of Deutsche Babcock.

Carlos A. Rosati has been named general manager of the Centrales Termicas Mendoza S.A. electric generating plan in Argentina`s Mendoza Province. C.T. Mendoza plant is 80 percent owned and operated by CMS Operating S.A., an Argentine subsidiary of CMS Generation.

Dennis K. Williams is president and CEO of GE Power Systems Europe and Nuovo Pignone, based in Florence, Italy.

B.J. Behroon has been named Siemens Power Ventures vice president in Ankara, Turkey.