Mark Douglas Siegmund

Mark Douglas Siegmund — Patent Litigation Practice Summary

Mark Siegmund is an IP litigation partner at Cherry Johnson Siegmund James, PLLC in Waco, Texas, where the firm's website identifies him as head of its IP team. His tracked docket reflects a plaintiff-side practice (3 of 3 appearances) acting as local counsel in Eastern District of Texas patent cases, including software/streaming matters (SportsCastr Inc. v. Genius Sports Ltd. and SportsCastr Inc. v. Sportradar Group AG, both involving live-video streaming and socket-based event-data synchronization patents) and the WSOU/Brazos Licensing matter over U.S. Patent No. 8,441,721 (2:24-cv-00332). Beyond the tracked cases, his publicly reported work spans a broader technology range — drone/aerospace, oilfield perforating tools, medical devices, semiconductors, and cybersecurity — and he has worked both sides of the "v," including defense verdicts and summary judgment wins for operating companies (e.g., DynaEnergetics, Howard Midstream, Zynga) alongside NPE-side enforcement work.

Before joining CJSJ (partner since the firm's March 2023 founding from predecessor Steckler Wayne Cherry & Love PLLC), he served as a law clerk to U.S. District Judge Alan D. Albright in Waco and helped develop the Western District of Texas' local patent rules — background that underpins his frequent local-counsel role for out-of-state litigants in Texas venues. His most prominent reported result is Textron Innovations LLC v. DJI, where he helped secure a $279 million jury verdict (recognized by Top Verdict as among the largest U.S. verdicts of 2023). He also assisted in the § 285 fee award in Decapolis Systems LLC v. CHRISTUS Health (E.D. Tex.).

On PTAB/IPR experience: his tracked district court appearances have proceeded alongside related IPRs — Genius Sports filed IPRs (IPR2024-01308/1309/1311) against the SportsCastr patents, culminating in final written decisions (March 2026) finding challenged claims unpatentable (now on appeal), and Cisco's IPR2025-00241 against the '721 patent settled in February 2025 with stipulated dismissal. Available PTAB records list other counsel (e.g., Brian Eutermoser) as respondent lead counsel, so Siegmund's personal IPR argument history is not established from these sources, though his firm advertises post-grant practice.

Bar/education: Admitted to the State Bar of Texas (2019), the Eastern and Western Districts of Texas, and the Federal Circuit; J.D. magna cum laude from Baylor Law School (top graduate, summer 2019) and B.B.A. in Finance from Texas A&M (per Baylor Law and Super Lawyers profiles).