Mark D. Siegmund

I'll research Mark D. Siegmund's professional background and patent litigation practice.

Let me verify the notable case outcomes and PTAB/IPR involvement.

Let me verify his patent registration status and a couple remaining details.

Mark D. Siegmund — Cherry Johnson Siegmund James, PLLC (Waco, Texas)

Specialty / focus. Siegmund's practice is concentrated in patent litigation in the Western District of Texas, Waco Division, where he is a partner and head of his firm's IP team. His tracked matters span NPE-style wireless and networking suits (VoIP-Pal's Wi-Fi calling/telecom patents against Verizon and T-Mobile; Malikie Innovations; Intellectual Ventures matters against Tesla, Deere, and Southwest Airlines), semiconductors (Palisade Technologies v. Micron and T-Mobile; Future Link Systems v. Realtek; Purdue University v. STMicroelectronics), software/audioconferencing (Paltalk Holdings v. Cisco), aerospace and drone flight control (Textron v. DJI), oil-and-gas well completion (DynaEnergetics), medical devices (RSB Spine), cybersecurity (Webroot/OpenText v. CrowdStrike), and consumer products (ChargeLogic v. Tesla; IngenioSpec v. Apple; Speednic v. Nvidia). The recurring pattern is Texas-venue patent enforcement rather than a single technical niche.

Side preference. He is predominantly plaintiff-side: 27 of 39 tracked appearances are for plaintiffs versus 12 for defendants. That split is driven largely by his role as Texas local counsel for out-of-state plaintiffs' firms and NPEs, but he also takes defense work and has represented operating companies including Realtek, Zynga, Cisco-opposing-side/defendant parties, and T-Mobile, so he is not exclusively a repeat player on one side.

Firm context and roles. He has been with Cherry Johnson Siegmund James since March 1, 2023, when he moved from Steckler Wayne Cherry & Love PLLC (per a filed notice of change of firm in Paltalk Holdings v. Cisco). Baylor Law School's directory previously listed him at the Law Firm of Walt Fair, PLLC, consistent with two tracked appearances there (including Smart Mobile Technologies v. Apple). Most tracked appearances are designated "local counsel" (17) or "Local Counsel" (6), with a smaller set of lead-counsel roles.

Notable cases. The most prominent is Textron Innovations v. SZ DJI Technology, where a Waco jury returned a $278.9 million willful-infringement verdict on April 21, 2023; Siegmund is listed among Textron's counsel in contemporaneous trial reporting (McDermott, Baker Botts, Cherry Johnson Siegmund James, and Steckler Wayne Cherry & Love). He also served as local plaintiff's counsel in Paltalk Holdings v. Cisco, which produced a $65.7 million Waco verdict reported by The Texas Lawbook. In VoIP-Pal v. Verizon and v. T-Mobile, the district court granted summary judgment of non-infringement against his client, motions for reconsideration and attorney fees were denied, and the Federal Circuit appeals were voluntarily dismissed in 2025 after settlements. Additional results (DynaEnergetics non-infringement defense, IGT v. Zynga, Estech Systems, Future Link v. Realtek, $279M Textron verdict) appear in the firm's own Super Lawyers profile and are not all independently corroborated here; the Textron verdict, Paltalk verdict, and VoIP-Pal outcomes are verified by third-party reporting.

PTAB / IPR. His firm actively files IPRs (e.g., IPR2025-00522, with firm attorneys as petitioner's counsel), and Siegmund appears as identified litigation counsel in at least one IPR involving the Future Link Systems/Realtek dispute. I found no source confirming that he personally serves as lead PTAB counsel or that he is a USPTO-registered practitioner; treat his IPR experience as litigation-side rather than established post-grant practice.

Bar / education. Admitted to the State Bar of Texas in 2019 (Bar No. 24117055) and to the W.D. Tex. (2019), E.D. Tex. (2020), and N.D. Tex., plus the U.S. Court of Appeals for the Federal Circuit. J.D., magna cum laude, Baylor University School of Law (top graduate, summer class of 2019); B.A. in Finance, Texas A&M University. He clerked for Judge Alan D. Albright in the Waco Division and is an adjunct professor at Baylor Law. Super Lawyers lists him as a Rising Star (2023–2026).