David Sun is a Principal and National Leader of incident response and forensics at CohnReznick’s Cybersecurity, Technology Risk, and Privacy Practice. He has 25 years of cybersecurity and IT management experience responding to data breaches and privacy incidents, internal employee malfeasance, and government agency investigations.
Sun has served as a testifying expert or court appointed expert on hundreds of litigation matters. This includes providing expert testimony related to the handling of classified information by a Cabinet member and the destruction of public records by a sitting mayor of a major city; providing security assessments in support of the United Nations, the 2004 Summer Olympics, and various United States Federal Reserve Banks; assisting multiple state attorneys general to investigate a variety of data privacy violations; and more. Sun draws upon his experience responding to cyber incidents when providing cybersecurity advisory services. This allows him to create pertinent and practical processes to help mitigate the latest risks of cyber-attacks.
Prior to joining CohnReznick, from 2002 to 2019, Sun was the founder and president of SunBlock Systems, Inc., a global litigation and cybersecurity advisory firm. Through acquisition, he joined CliftonLarsonAllen (CLA) as a principal and its national practice leader for cyber incident response and forensics. He was also a co-founder and Chief Technology Office of S34A, a company that performed research on advanced computer forensics techniques for the Department of Homeland Security and other government agencies.