ABSOLUTE GREEN ENERGY CORP. — The Worchester, Mass.-based company, which provides energy cost- reduction products and services, named Fred Charpentier vice president of sales and marketing.
AMPACET CORP. — The compounder in Tarrytown, N.Y., named Michel Sarao account executive for Quebec and the Maritimes region for Ampacet Canada Co. of Kitchner, Ontario.
CONVERGENT COMPOSITES LLC — Bob Lacovara, former director of technical services with the American Composites Manufacturers Association, was named president of the newly formed consulting company in Perkasie, Pa.
CROCS INC. — The manufacturer of plastic clogs based in Niwot, Colo., named John Duerden chief executive officer and president, succeeding Ron Snyder, who is retiring.
GAMMAFLUX LP — The supplier of hot-runner temperature-control equipment headquartered in Sterling, Va., named Jeff Colman chief executive officer and president, succeeding David Huntting, who was named chairman. Vince Leone was named vice president.
HEXCEL CORP. — The composites manufacturer in Stamford, Conn., named Doron Grosman president, succeeding William Hunt, who will remain in an advisory role until his retirement April 1.
PROTO LABS INC. — The injection molding and computer numerically controlled machining firm in Maple Plain, Minn., named Isao Yada president, Masako Ono sales and marketing director and Khing Tam operations director for Proto Labs K.K., its new subsidiary in Ebina, Japan, near Tokyo.
STEERAMERICA — The twin-screw extruder manufacturer in Uniontown, Ohio, named Paul Rogers regional sales manager. SteerAmerica is a division of Steer Engineering Pvt. Ltd. of Bangalore, India.
TESA TAPE INC. — The maker of pressure-sensitive adhesive tape in Charlotte, N.C., named Clay Goins sales specialist for general manufacturing and distribution, and Sean Struble national marine sales specialist. Struble will relocate to Tampa, Fla.
WALL COLMONOY CORP. — The heat-transfer-technology firm in Madison Heights, Mich., named Craig Johnson vice president of its Alloy Products Group.