King & Spalding is fleshing out its Silicon Valley office with two Sidley Austin partners.

Timothy Scott, who was Sidley’s San Francisco litigation chair, and Geoffrey Ezgar joined King & Spalding as partners in Redwood Shores today.

The Atlanta firm has been expanding in two Northern California locations since the start of the year. The latest arrivals bring the number of partners in those offices to 10, according to the firm.

Scott and Ezgar have focused on securities and commercial litigation matters at Sidley, which they joined six years ago from Wilson Sonsini Goodrich & Rosati.

Sidley’s San Francisco office managing partner, Paul Pringle, declined to comment on the move.

Scott and Ezgar said that they liked King & Spalding’s approach in Northern California: The firm has shown an appreciation for the distinctions between the San Francisco and Silicon Valley markets by opening offices in both locations, they said. The firm opened in Silicon Valley in February by plucking a group of IP litigators from Perkins Coie. The firm launched in San Francisco in April with two partners from Drinker Biddle & Reath.

In addition to the Silicon Valley location, Scott said that it was equally important for his practice to be at a firm that shows commitment to technology and life sciences companies. “Even in San Francisco, most of the work I was generating was out of Silicon Valley,” he said. Although he said he couldn’t discuss current clients, he did say that he has worked for pharmaceutical companies Eli Lilly and Bayer in the past.

Scott said the pair’s initial focus will be adding to the securities and commercial litigation practice, in life sciences and in King & Spalding’s other practice areas, such as energy, finance and technology. Ezgar said that he will primarily work out of Silicon Valley, but will spend some time in San Francisco to continue representing auditors and accountants in professional liability cases.

Of its roughly 900 lawyers worldwide, King & Spalding says it has more than 125 lawyers and professionals focusing on pharmaceutical, biotech and medical device areas.

San Francisco legal recruiter Gary Davis, who was not involved in the match, said that Scott is one of the premier securities litigators in the Bay Area. “Nobody needs service partners,” he said. “What people are looking for are leaders, and he has a proven track record.”