David W. O'Brien

David O'Brien leads the firm’s Patent Office Trials Practice Group and focuses on Inter Partes Review (IPR) and other post-grant proceedings before the Patent Trial and Appeal Board (PTAB). He has more than 25 years of experience in software, semiconductor, microprocessor architecture, information security and protocol related technologies. David handles all phases of post-grant proceedings, from development of the grounds of challenge to petition drafting, briefing, trial, oral argument and appeal strategy. He is an experienced lead counsel in petitioner-side and patent owner-side representations alike. David has served as lead counsel in numerous high-profile disputes and successfully handled over 80 contested PTAB proceedings. 

David's representation of technology clients builds on substantial prior-career experience including R&D for DARPA and other defense-sector clients in areas of multiprocessor architecture; software and algorithms for parallel and distributed computing; semiconductor devices, fabrication and materials; internetworking protocols; process control; opto-electronics and lasers, and computer vision/imaging systems. His legal representations leverage deep technical expertise and a capacity to explain innovations in hardware, software, and other advanced technologies. 

David is a frequent speaker and widely published on PTAB trials, joint/divided infringement, patent law generally, and the protection of computer software.