SAN FRANCISCO — Shartsis Friese announced Tuesday it has launched a tech-focused patent prosecution practice with two senior attorneys from Greenberg Traurig.

Cecily O’Regan and William Cray joined Shartsis this week as of counsel.

O’Regan, whose practice focuses on emerging technology clients, particularly those in the medical device, biometric sensor, software, and clean tech sectors, said in an interview that she hit the ground running Monday.

“It’s going well so far, but I have a lot of files scattered all over,” O’Regan said, laughing. “My clients already thought I’d settled in [right away].”

Cray works on electronic, electrical and electro-mechanical arts, including controllers, diagnostic systems, optics and Internet technologies. He has served as head patent counsel for both Fortune 500 companies and divisions of Fortune 500 companies, and is a former chairman of the Semiconductor Industry Association Law Committee.

Before coming to Greenberg, O’Regan, a coinventor in her own right on several patents covering medical devices and software, worked at Wilson Sonsini Goodrich & Rosati. She also served as vice president of legal affairs for a medical device startup and worked in-house at Agilent Technologies Inc. and Hewlett-Packard Co. She said her more recent experience in big firms drew her to a smaller shop like Shartsis.

“I was excited by the opportunity to come to a firm that not only has top-tier attorneys counseling top-tier clients, but is small enough to be nimble and agile to work with the kind of startup clients I deal with,” she said.

Over the last several years, she noted, conflicts had become an increasing issue. “You can only tell your clients ‘no’ so many times,” she said.

Shartsis partner James Martin said in an interview the firm was “really pleased” to bring the patent lawyers aboard to launch the practice, which rounds out the firm’s “booming” IP litigation and tech transactions practice.

“Quite frankly we’ve been looking for the right person or small group for quite a few years,” Martin said. O’Regan and Cray “were really just the perfect fit.”

Contact the reporter at callison@alm.com.