Orrick Herrington & Sutcliffe has made a second dramatic raid on Heller Ehrman Venture Law Group, securing a further four technology partners.

Partners Don Keller, Tom Tobiason, Mark Windfeld-Hanson and Mitch Zuklie will join Orrick’s Silicon Valley office.

The move comes just a month after Orrick took five technology partners from Heller Ehrman Venture Law Group.

As first revealed on www.thelawyer.com (15 February), John Bautista, David Lee, Mike Morrissey and Glen Van Ligten last month quit Heller Ehrman for Orrick’s 80-lawyer Silicon Valley office, while a fifth partner, Ned Ruffin, joined the firm’s Washington DC office.

The five were founders of Silicon Valley’s Venture Law Group before moving to Heller Ehrman in 2003, when the two firms merged.

Keller, Tobiason, Windfield-Hanson and Zuklie are expected to join Orrick within the week.

Prior to its merger with Heller Ehrman, the now 108-lawyer Venture Law Group had enjoyed a longstanding referral relationship with Orrick, which alongside Morrison & Foerster was among those firms battling to secure a tie-in with the venture capital firm.