Suggestions
Dennis Dayman
Dennis has more than 30 yrs of experience combating spam, security/privacy issues, data governance issues, and improving data flows. Frequent seed investor
Dennis Dayman is an accomplished cybersecurity expert who was recently appointed as the Chief Information Security Officer (CISO) at Code42, a company specializing in data loss and insider threat protection that was acquired by Mimecast.1
With over 30 years of experience in the field, Dayman is recognized for his expertise in combating online abuse, managing security and privacy solutions, conducting data governance, and improving data flows.2 His career has been marked by significant contributions to the cybersecurity industry, particularly in areas such as spam prevention, privacy issues, and data protection.
Professional Background
Dayman's career includes several notable positions:
- CISO at Code42 (current role)
- Resident CISO at Proofpoint
- Chief Privacy and Security Officer at Maropost, Return Path, and Eloqua
He has also held leadership roles in various other organizations, demonstrating his versatility and depth of knowledge in the cybersecurity sector.3
Contributions and Achievements
Government Advisory Roles::
- Chair of the Policy Subcommittee for the U.S. Department of Homeland Security's Data Privacy and Integrity Advisory Committee
- Appointed advisor to the DHS on matters related to personally identifiable information and privacy3
Industry Involvement::
- Longstanding member of several boards and advisory committees within the advertising and messaging industry
- Partner, mentor, and frequent investor in tech startups3
Advocacy:: Dayman is known for his "people-centric" approach to security, emphasizing the importance of understanding human behavior in developing effective compliance and defense strategies against cyber threats.
Education and Expertise
Dayman graduated from Stephen F. Austin State University, which laid the foundation for his extensive career in information security and privacy. His areas of expertise include:
- Combating spam and online abuse
- Security and privacy solutions
- Data governance
- Email delivery improvement
- International electronic commerce
- Internet-related policy issues
In his role at Code42, Dayman is responsible for leading global risk and compliance, security operations, incident response, and external and internal threat management and investigations.1 His appointment is seen as a strategic move to enhance Code42's information security and IT risk management programs.


