Programming /Software / Modeling Expert Witnesses: 18

Dr. Stephen Castell, Chartered Information Systems Practitioner and Member of the Expert Witness Institute, is Chairman of CASTELL Consulting. He is an internationally acknowledged Independent Computer Expert who has been involved in a wide range of computer litigation over many years. CASTELL Consulting, currently in its twenty-fifth year, provides independent professional consultancy and expert services in Computer Systems, Software, Project Management, Strategy, and Contract Disputes, to a wide variety of international clients and companies. 

As an Expert Witness in computer litigation, Dr. Castell has acted in over 100 major cases including the largest and longest computer software actions to have come to trial in the English High Court. He is the author of the best-selling Computer Bluff (1983), and of The APPEAL Report (1990) on the admissibility of computer evidence in court and the 'legal reliability' of information systems and technologies (with the CCTA).

Dr Castell, award-winning international Professional ICT Consultant and Expert has acted as expert witness in an unusual medical equipment procurement litigation of relevance to the current Covid-19 pandemic and its profound clinical and hospitalisation implications.  The court case, specific details of which cannot be given since the matter is subject to Confidentiality Hearing strictures, was over a dispute concerning due and diligent process undertaken by a major Hospital Management Group, the Defendant in the action, in issuing a Tender for complex diagnostic units, and the Group’s selection of the bid put in by a US corporation, a leader in its field.  That winning bid was challenged by a Claimant, another US corporation, a market competitor to the winning company.  The dispute hinged on whether or not the operational computer software of the winning bidder’s units was compliant with the Hospital Management Group’s strict Tender stipulation that the software had to be identical across all versions of the equipment to be supplied in meeting the Tender requirements.  

Dr Castell’s investigation and analysis of the operational software involved, and his opinion as to the extent that the software was compliant with the strict Tender condition, provided insight and assistance to the parties in reaching a satisfactory settlement.

Baw Chng is a highly experienced Networking, Communications, Computer, and Software expert. He is an inventor with 11 patents in communication and networking technology. He is also a published author, public speaker, and USPTO Registered Patent Agent.

Experience: 24+ years of professional experience in telecom and networking. Consulted for Tier-1 national communication service providers and their strategic technology vendors. Experienced in engineering R&D, standards development, and patent assessment. Baw Chng has published papers, given public talks/presentations, provided expert consulting, written expert reports, provided deposition & testimonies as an expertness.

Ideal Client - Litigators who work on cases that involve complex technical issues, patent and intellectual property related issues, business contract cases that involve sophisticated technology.

Areas of Expertise

Technical Skills and Knowledge include:

• 3GPP and 3GPP2 families of cellular mobile broadband radio access and core network standards, small cells, femtocell, inter-technology handover and roaming
• IEEE 802.11 (Wi-Fi, mesh, infrastructure), 802.3 (Ethernet), 802.15 (WiMAX), 802.16 (WPAN) families of standards
• Network architecture, telecom system architecture
• Internet standards and protocols, TCP/IP, UDP, RTP, DHCP, DNS, ARP, GRE, etc.
• Internet-of-Things (IoT), M2M, LoRa, LoRaWAN, LTE Cat-M, NB-IoT
• Hotspot 2.0 / Passpoint (for Wi-Fi)
• IPsec, IKEv2, L2/L3 tunneling, NAT/NAPT (firewall)
• SAML, SAMLv2 federation; oAuth, oAuth 2.0 authentication; RADIUS, DIAMETER
• Network & device management, Broadband Forum TR-69 and IETF SNMP standards
• Software Defined Networking (SDN), Network Function Virtualization (NFV)
• Self-Organizing Network and Self-Optimizing Network (SON)
• Web Services, REST/JSON API design & implementation, HTTP
• Cloud computing, Amazon Web Services (AWS)
• Big Data, Avro, Parquet
• Plastic Optical Fiber (POF), Optical Networking
• Software architecture, Object-oriented design and programming, design patterns
• Go Lang, C, C++, Perl, LabVIEW, BASIC, Pascal, Unix shell scripting languages
• HTML, CSS, web design & development, web hosting, JavaScript, CGI Programming
• Operating systems (RTOS, various Unix/Linux variants, iOS, Android, etc.)
• Quality of Service (QoS), Fair Scheduling, Fair Queueing
• Interconnection networks and switching fabrics for parallel computers, network switches, and routers

Master's degree in Computer Science (MSCS), Bachelor's degrees in Electrical Engineering and Computer Engineering (BSEE, BSCoE), Washington University in St. Louis.

View BAWMAN LLC's Consulting Profile.

Michael D'Angelo has over 15 years of experience in Digital Forensics and has built, led and maintain sophisticated forensic analysis teams and labs. His experience extends from data collections, data recovery, advanced analysis and expert testimony. He has analyzed data from thousands of devices and has testified on dozens of cases on local, state and federal cases.

Areas of Expertise: Digital forensics, computer forensics, data recovery, mobile forensics, data collections, ediscovery, forensic imaging, forensic analysis, digital forensic analysis, computer forensic analysis.