E911-LBS Consulting

E911-LBS Consulting

David Williams

P.O. Box 220442 Saint Louis, MO 63122

About the Expert

David H Williams is an expert in wireless/mobile location technology, applications, and services. His specialties include GPS tracking, cellular forensics, location-based services (LBS), E911, Internet of Things (IoT), and other wireless location technologies and services. He has served as an expert in over 150 location-related patent/IP, cellphone forensics, anti-trust, ITC, and criminal/civil cases since 2007. He has been deposed 14 times and has testified in court 5 times, including Federal District Court. We also provide cellphone forensic data extraction, analysis, reports, and testimony on the validity and accuracy of electronic data in accident reconstruction and crime/crime scene analysis. This includes all types of GPS-based, triangulation-based, and cell tower-based systems and emergency/public safety E911/112/110 systems, as well as many other location-based survelliance devices and associated tracking technologies and systems. We use CDR (Call Detail Records), NELOS,PCMD, RTT, and EVDO data, using Hawk Analytics and Paraben/Cellebrite cellphone tools. We also analyze data from other sensor-types (particularly IoT and OBD II port-based sensors for trucks/vehicles) using various forensic tools. Mr. Williams is different in that he learned his craft from the inside - designing and implementing location architectures and systems for wireless carriers, location services application providers, and other companies. Thus, when others get stopped by 'the carrier/app provider said...', Mr. WIlliams can can provide the detailed explanations about why that is (or is not) accurate AND know what questions to ask to get to the real heart of the matter. He is also different in that he can provide mobile forensics investigation and reconstruction regardless of the platform from which the location records are extracted. This capability is rapidly becoming critical as location applications proliferate, and 'old fashioned' phone and even text records (the historical bread-and-butter of the mobile forensics world) lessens in relative importance. Platforms Mr. Williams has worked with/has expertise on include: Apple and Google (iOS and Android) AVL (Automatic Vehicle Location) Systems (Multiple Platforms) Aviation (GPS systems) Connected Cars/Driverless Cars E911 (Wireless Enhanced 9-1-1 systems) Facebook/Instagram/Messenger Google Maps/Earth/Timeline (Specialty) GPS (e.g Parolee Ankle Bracelets, Asset Trackers) Home/Industrial Automation systems Internet of Things (Multiple Platforms) Internet web browsing (multiple platforms) Location Aggregators SMART systems (Cities, Buildings, Infrastructure) Social Media (beyond Facebook) Survelliance and Safety Systems Vehicle Trackers

Areas of Expertise

  • Communications - Telecommunications
  • Electrical Engineering
  • GPS Tracking

Expert's Profile

David Hilliard Williams is an internationally-known expert in the wireless/mobile location field and President and Founder of E911-LBS Consulting. He specializes in wireless location product and technology strategy development and implementation, as well as Intellectual Property (IP)/patent and location forensics litigation services involving location technologies such as Global Positioning Satellite (GPS) systems; Network-based location determination technologies such as TDOA, ECID, and AFLT; Wireless 911 (E911) and Next Generation 911; Real-Time Location Systems (RTLS) including Radio Frequency Identification (RFID) systems, Wi-Fi-based positioning systems (WPS), BLE/Beacon-based location systems, and alternative RTLS (Ultrasound, Infrared); Near Field Communications (NFC); Wearable Tags/Sensor tracking systems; Zigbee/Mesh networks; and various hybrids and combinations.

Mr. Williams is expert in the full range of business and consumer location-based services (LBS) and IoT applications enabled by these location technologies, including safety, security, and intruder detection/monitoring, vehicle/fleet tracking/mgmt, telematics, local search, navigation systems, presence/context-aware apps, mobile resource management, asset and freight management, wearable tags/sensors, financial/mobile wallet, mobile hospitality/POS systems, supply chain management, family tracking, mobile social and business networking, proximity-based entertainment and leisure, gaming, and intelligent transportation systems.
Mr. Williams has extensive expertise in all aspects of LBS and IoT delivery across the mobile location ecosystem including enabling network communications, location technologies/sensors, geofencing design, map data, location data/database management, geospatial platform/Geographical Information Systems, GPS and other location chipsets, location data management, and device, infrastructure and integration providers. His client list includes Apple (2), AT&T, FedEx, GE, GM, Geotab, Google (5), the Houston Police Department, the L.A. County District Attorney’s Office, Lyft, Macropoint, Nextel, NAVTEQ, Qualcomm, Peschke, Samsung (3), Sprint, Toyota, Twilio, Verizon Wireless, VIVINT, Volkswagen, and Zillow. He has successfully represented both prosecutors and defendants in criminal litigation (including assisting State Public Defender entities), as well as both sides of civil litigation. He has been deposed 14 times and has testified 5 times, including successfully in The Eastern District Court of Texas, winning both infringement and invalidity cases.

Mr. Williams is expert in smart location technology issues in the Internet of Things (IoT) and connected/driverless car fields, particularly in their utilization of location and context information through the practical envisioning and design of: consumer/enterprise use cases and associated application design, sensor design and deployment strategies; process (re)engineering; IT integration; data aggregation, segmentation, analysis, and management; scalability; and security and privacy issues, requirements, collaboration structures, and ongoing management. He is expert on Big Data issues associated with location data.

Mr. Williams has developed and implemented industry-leading product and technology solutions for numerous LBS applications and markets and provides consulting and research services to some of the leading carriers and enterprises in the U.S., Asia, and Europe. He has provided testimony, consulting research, technical expertise and advisory services in over 150 IP/Patent, Criminal/Civil Forensics, Product Liability, ITC, and Anti-Trust litigations/cases.

With over thirty years in location, communications and information technology solutions design, selection, implementation and ongoing management, Mr. Williams has extensive experience in the activities and issues needed to get applications to market, including planning and design at the application, system, interface/integration, network, IT, operational and customer facing levels. He has been published and quoted by leading magazines and newspapers about location-related services, including The New York Times, CBS News.com, The Columbus (Ohio) Dispatch, The Boston Globe, Computerworld, Directions Magazine, Mission Critical Communications, Popular Mechanics, and RFID Journal.

Mr. Williams has authored five books on wireless location, including The Definitive Guide To RFID, Wi-Fi, Bluetooth Low Energy (BLE), UWB, Ultrasound, Infrared, and Other RTLS and IoT Technologies (available May 2019), The Definitive Guide to GPS, RFID, Wi-Fi, and Other Wireless Location-Based Services (two versions), The Definitive Guide to Wireless E911, and (co-authored) The Definitive Guide to Mobile Positioning and Location Management. Mr. Williams has authored dozens of research reports, and tracks and analyzes leading companies in the LBS, IoT, and public safety industries particularly with respect to their product and technology strategies, competitive capabilities and implementation issues. He is expert on all public policy and technology issues related to emergency services/public safety, location data privacy and security, and LBS and IoT privacy protection policies, systems, and support infrastructure. He opines on location privacy issues in various forums.

Personal Achievements


  • BSEE - Purdue University (top honors); MBA - The University of Texas at Austin (1st in graduating class)

Special Training

  • Trained on numerous mobile/computer/data extraction and analysis tools including Cellebrite, Paraben, and Cell Hawk.


  • Certified in Emergency Management Response (CERT)


  • Patent - ;Method and apparatus for providing mobile social networking privacy." (U.S. Patent Number 8,613,109, issued on December 17, 2013)
  • 1. The Definitive Guide To RFID, Wi-Fi, BLE, UWB, Ultrasound, Infrared, and Other RTLS and IoT Technologies (available May 2019)
  • The Definitive Guide to GPS, RFID, Wi-Fi, and Other Wireless Location-Based Services (2 versions)
  • The Definitive Guide to Wireless E911
  • The Definitive Guide to Mobile Positioning and Location Management (Co-authored)

More Information

Listed in the Following States

E911-LBS Consulting is listed with ExpertPages in the following jurisdictions: All US Regions and States, Canada (all Provinces).