Tomophase Corp. tapped a former Pfizer executive, Ralph Johnston, to be its new president and COO.

Johnston worked for Norwood, Mass.-based Infusaid Corp., which developed an implantable drug infusion system and was acquired by Pfizer (NYSE:PFE). Johnston stayed with Pfizer after the acquisition, rising to vice president of marketing and sales for the Infusaid division. Pfizer sold Infusaid in 1997.

Tomophase co-founder, chairman and CEO Dr. Peter Norris said in prepared remarks that Johnston’s clinical relationships will come in handy as the company looks to finish development and commercialize its technology