David Mattern focuses on complex litigation and intellectual property matters. He counsels technology companies in suits concerning copyright law and the DMCA, suits implicating Section 230, and in suits relating to cybersecurity. David has extensive experience defending clients in a wide range of matters at the trial and appellate level in state and federal courts.

David has represented clients at trial and appeal in courts across the country. David has particular expertise in copyright law and platform defenses, including representing platforms in copyright litigation and rate court disputes, and in defending platforms in suits related to user content and content moderation under the DMCA and Section 230. His experience extends to a wide range of subject areas, including False Claims Act litigation, product liability litigation, professional liability litigation, and many other types of business litigation.

David devotes a significant amount of time to pro bono civil rights litigation. Recent successful representations include obtaining reversal of a grant of qualified immunity to prison officials in a suit brought under Section 1983 in a case he argued in the Ninth Circuit, and in obtaining a reversal of a grant of summary judgment to prison officials on exhaustion under the PLRA in a case he argued in the Seventh Circuit. 

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