Telecommunications expert witness — communications systems, protocols, and wireless technologies
Dr. Tal Lavian is a telecommunications expert witness based in California, with a Ph.D. in Computer Science from UC Berkeley and over 35 years of experience in telecommunications systems, network communications, and Internet protocols. He has been retained as a telecommunications expert witness in over 90 cases before U.S. federal district courts — including the District of Delaware, the Central District of California, the Northern District of California, and the Eastern District of Texas — the USPTO Patent Trial and Appeal Board (PTAB), the International Trade Commission (ITC), and international tribunals, with over 60 depositions. Dr. Lavian has invented more than 120 patents, prosecuted over 60 pro-se at the USPTO, and has been retained by over 50 law firms and corporate clients. Dr. Lavian is currently available for new engagements (2026).
Dr. Tal Lavian is a telecommunications technology expert specializing in data communications, computer networks, and internet protocols (TCP/IP). With over 35 years of experience as a scientist, educator, and technologist, Dr. Lavian offers technical consulting in telecommunications, network communications, computer communications, and internet protocols. His work has covered computer networks, data communications, LAN/WAN, TCP/IP, UDP, VPN, voice over IP (VoIP), streaming media, chat, SMS, network security, mobile wireless, Ethernet, routing, switching, the internet, web technologies, and communication standards.
Dr. Lavian has spent nearly 20 years researching, studying, and lecturing at UC Berkeley. His research focuses on telecommunications systems, data networks, network services, software, network protocols, and communications frameworks. He holds a Ph.D. in Computer Science from UC Berkeley, specializing in network communications.
While at UC Berkeley, Dr. Lavian conducted research projects in data centers (RAD Labs), network communication service architecture (SAHARA), and wireless systems (ICEBERG); he also served as an industry fellow and lecturer at the Sutardja Center for Entrepreneurship and Technology (SCET) and as a scientific liaison between Nortel Research Lab and UC Berkeley. Dr. Lavian was also part of UC Berkeley's SkyDeck start-ups, where he worked on technology research and implementation.
Dr. Lavian has co-authored over 25 scientific publications, journal articles, and peer-reviewed papers and has presented his work at conferences. He is also the inventor of over 120 issued and filed patents. His peer-reviewed publications and citation record are indexed on Google Scholar.
Areas of Expertise:
Dr. Lavian has academic and industrial experience with network communications, data communications components, and Internet architecture. As a telecommunications and internet expert witness, his work has covered:
Network Communications
Network communication, LAN, WAN, VPN, MAC, Ethernet, network protocols, packet switching, and computer networks.
Routing and Switching
Routing and switching systems, architectures, and protocols, including routing protocols, MPLS, OSPF, QoS, and priority queuing.
Internet Expert Witness
TCP/IP protocol suite, UDP, IP, MAC, HTTP, VPN, SSH, SNMP, SIP, IPv4, and IPv6.
Data Communications
Connecting devices and computers to share data and resources. Data transmissions. IEEE and IETF RFCs standards.
Voice over IP (VoIP)
Voice over IP (VoIP) protocols, traditional PSTN infrastructures, SIP, RTP, devices, and protocols.
Streaming Media & Video
Streaming media, video/audio conferencing, multimedia, and video/audio streaming.
PSTN, VoIP & Cellular
PSTN, VoIP, circuit switching, SS7, SONET, cellular systems, telecom architecture, and network infrastructure.
Network Management
The Network Management Systems (NMS), Device Management, SNMPv2, SNMPv3, MIB, Alarms, Alerts, Traps, and Reporting.
Network Security
Network security architecture, Firewalls, VPN, SSL, TLS, HTTP, IPSec, Tunneling, Content Filtering, and Security Gateways.
Mobile & Wireless
Mobile wireless networks include Wi-Fi, 802.11, Wireless LAN (WLAN), mobile devices, and smartphones.
Messaging & Chat
Short messages service, SMS, MMS, Instant Messages (IM), chat, and chat applications.
Computer Networks
Communications network devices, routers, switches, gateway — hardware and software system, architecture, and design.
What Technology Areas Does Dr. Lavian Cover?
Dr. Lavian has provided expert analysis across a range of telecommunications and network communications technologies in patent litigation, including proceedings before U.S. federal district courts, the USPTO PTAB, the ITC, and international tribunals. The technology areas he has worked in include:
- Routing, Switching & MPLS — MPLS tunneling, routing protocols (BGP, OSPF), packet switching, switch architectures, Spanning Trees, L2/L3 network architectures, VPLS, Pseudowire, and link aggregation.
- VoIP, PSTN & Telephony — VoIP protocols (SIP, RTP), PSTN architectures, telephony CDR analysis, IVR systems, unified communications, and carrier-level telephony systems.
- Network Security — Firewalls, network access control (NAC), VPNs, IPSec, SSL/TLS, deep packet inspection, content filtering, and security gateway architectures.
- Mobile & Wireless — Wi-Fi (IEEE 802.11), wireless LAN (WLAN), wireless access technologies, mobile devices, and wireless network architectures.
- Internet & Web Technologies — Internet protocols (TCP/IP), HTTP/HTTPS, web application architectures, e-commerce systems, DNS, and distributed network services.
- Streaming Media & Video — Video/audio conferencing, streaming protocols, multimedia delivery, video coding, and content distribution.
- Network Management — Network Management Systems (NMS), SNMP, device management, OSS, alarm systems, and network diagnostics.
- Messaging & Unified Communications — SMS, MMS, instant messaging, chat applications, and email systems (SMTP, email headers).
- Computer Networks & Data Communications — Routers, switches, gateways, KVM architectures, network device software, and broadband access equipment.
Dr. Lavian's Qualifications as a Telecommunications Expert Witness
Dr. Lavian holds a Ph.D. in Computer Science from UC Berkeley, specializing in network communications, an M.Sc. in Electrical Engineering from Tel Aviv University, and a B.Sc. in Mathematics and Computer Science. He spent nearly 20 years researching, studying, and lecturing at UC Berkeley, where he conducted research in data centers (RAD Labs), network communication service architecture (SAHARA), and wireless systems (ICEBERG), and served as an industry fellow and lecturer at the Sutardja Center for Entrepreneurship and Technology (SCET).
Dr. Lavian served as Principal Scientist and Principal Architect at Nortel Networks (1996–2007), where he was Principal Investigator for three U.S. Department of Defense (DARPA) projects and directed a networking computation project for the U.S. Air Force Research Lab (AFRL). He is an inventor of over 120 patents, with over 60 prosecuted pro-se before the USPTO, and has co-authored over 25 scientific publications and peer-reviewed papers in IEEE and ACM venues.
He is an IEEE Senior Member, a member of ACM (SIGCOM, SIGWEB), and has served as Technical Co-Chair of IEEE Hot Interconnects at Stanford University.
What Forums Has Dr. Lavian Testified In?
Dr. Lavian has provided live expert testimony at trial before judges and juries in U.S. federal district courts — including the District of Delaware, the Central District of California, the Northern District of California, the Eastern District of Texas, and the Western District of Texas — as well as the USPTO Patent Trial and Appeal Board (PTAB) in inter partes review (IPR), covered business method (CBM), reexamination, and interference proceedings; the International Trade Commission (ITC) Section 337 investigations; the Canadian Federal Court; a court in Malaysia; and arbitration proceedings.
His expert engagements span patent infringement matters in U.S. federal district court — including Markman claim construction hearings, summary judgment proceedings, and trial testimony before judges and juries — inter partes review (IPR) and post-grant review (PGR) proceedings at the PTAB, Section 337 investigations at the ITC involving allegations of patent infringement by imported telecommunications equipment, and international proceedings.
Frequently Asked Questions
Who is Dr. Tal Lavian?
Dr. Tal Lavian is a telecommunications technology expert with nearly 20 years at UC Berkeley, a Ph.D. from UC Berkeley, 120+ patents, and 90+ engagements in patent litigation across U.S. Federal and District Courts, USPTO PTAB, the ITC, the Canadian Federal Court, and a court in Asia.
What types of cases does Dr. Lavian handle?
Dr. Lavian provides technical consulting and testimony in telecommunications patent infringement cases, ITC Section 337 investigations, USPTO PTAB IPR/PGR proceedings, and technology disputes involving networking, VoIP, wireless communications, and internet protocols.
How many patents has Dr. Lavian invented?
Dr. Lavian has invented 120+ issued and filed patents covering network switch architecture, network security, VoIP/IVR systems, grid computing, quality of service, streaming media, and wireless communications. He has personally prosecuted over 60 patents pro-se before the USPTO, including drafting, claims, office action responses, and examiner interviews.
What courts and tribunals has Dr. Lavian testified in?
Dr. Lavian has testified in U.S. federal district courts including the District of Delaware, the Central District of California, the Northern District of California, the Eastern District of Texas, and the Western District of Texas; the USPTO Patent Trial and Appeal Board (PTAB); the International Trade Commission (ITC); the Canadian Federal Court; and a court in Malaysia. He has provided live testimony at trial before judges and juries in multiple federal court proceedings.
What is a telecommunications expert witness?
A telecommunications expert witness is a qualified technical professional retained by attorneys to provide independent technical opinions in patent litigation, ITC investigations, and other legal proceedings involving telecommunications technologies — including VoIP, wireless networks, internet protocols, and network communications systems. They analyze patent claims, prepare technical reports, provide deposition testimony, and — when cases proceed to trial — provide live testimony before judges and juries.
How many law firms has Dr. Lavian been retained by?
Dr. Lavian has been retained by over 50 law firms and corporate clients in telecommunications patent matters, including Fish & Richardson, Kirkland & Ellis, Gibson Dunn, Cooley, and Finnegan, among many others. He has also been retained in cases involving Apple, Google, Microsoft, Samsung, Cisco, AT&T, Verizon, T-Mobile, and other major technology companies.
How many years of experience does Dr. Lavian have in telecommunications?
Dr. Lavian has over 35 years of experience in telecommunications and network communications, spanning nearly 20 years researching, studying, and lecturing at UC Berkeley; engineering leadership as Principal Scientist and Principal Architect at Nortel Networks (1996–2007); service as a DARPA Principal Investigator for three federally funded research projects; and over two decades as an expert witness with 90+ cases and 60+ depositions.
What PTAB and ITC proceedings has Dr. Lavian participated in?
Dr. Lavian has served as a technical expert in USPTO Patent Trial and Appeal Board (PTAB) proceedings including inter partes review (IPR), post-grant review (PGR), and covered business method (CBM) proceedings; International Trade Commission (ITC) Section 337 investigations involving telecommunications technologies; U.S. federal district court patent infringement trials; and international arbitration proceedings, including the Canadian Federal Court.