After four years running a start-up biotech company formed to combat viruses, David Perryman has returned to law practice.

He left intellectual property boutique Needle & Rosenberg in 2007, where he’d practiced for 16 years, to become the CEO of Zirus. He is rejoining his former colleagues as part of Ballard Spahr, the Philadelphia-based general practice firm that acquired Needle & Rosenberg three years ago.

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