Henry Bunsow’s departure from Howrey cost the firm one of its top intellectual property rainmakers and one of the firm’s most recognizable names. According to former partners with knowledge of the firm’s financials, it also cost the firm a book of business worth around $20 million.

News broke yesterday that Bunsow was leaving the firm after nine years as the regional managing partner for Howrey’s Northern California offices and joining Dewey & LeBoeuf’s San Francisco office. Bunsow, who also served as Howrey’s vice chairman, took with him Howrey IP partners Denise De Mory and Brian Smith. Bunsow, De Mory and Smith all join Dewey as partners.