Chambers and Partners Ranked eDiscovery Expert, five years in a row (2018-2022). Warren has experience working in law enforcement and as a consultant, supporting law firms and corporations globally with incident response, computer forensics and Electronic Discovery. He is a co author of Computer Forensics: Incident Response Essentials. Warren was ranked as a top Professional Adviser in the 2018, 2019, 2020, 2021 and 2022 Chambers Litigation Support guide.

Testified as a Computer Forensic Expert for the US Securities and Exchange Commission (SEC) Conducted the computer and network forensics in the billion dollar "Comtraid" theft of Intellectual Property and Trade Secrets, for which he received the High Tech Crime Investigation Association’s Case of the Year Award. - frequent lecturer on computer forensics, incident response, and cybercrime. He has lectured internationally for groups including: SANS, Certified Fraud Examiners, ISSA, HTCIA, etc.