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Brian Mandelbaum
CEO at Attain
Building Klover into a consent-based first-party data platform that rewards consumers for data sharing, offering advertisers a privacy-compliant alternative to third-party cookies.
Last updated May 30, 2026 by the ATDb Editorial Team · Connections updated May 31, 2026
Bio
Brian Mandelbaum is the Co-Founder and CEO of Attain, a consumer-permissioned commerce data and advertising-measurement company. He has spent his career building first-party-data and programmatic advertising platforms, and was named an EY Entrepreneur Of The Year 2025 Midwest Award finalist.
Previous Roles
CEO
Clearstream.tv (2014-2018)
Senior Leadership
Various AdTech Companies (Prior to 2014)
Expertise
First-Party DataConsumer Data MonetizationProgrammatic AdvertisingPrivacy-Compliant AdvertisingIdentity ResolutionConsumer Engagement PlatformsData PartnershipsCookieless Targeting
Notable Achievements
- Led Klover to become a recognized first-party data and consumer rewards platform serving major brand advertisers
- Built a consent-based data model at Klover that aligns consumer incentives with advertiser data needs in a post-cookie environment
- Scaled Klover's user base to millions of consumers, creating a proprietary first-party data asset for advertisers
Speaking Topics
First-party data strategies in a cookieless worldConsumer-permissioned data and privacy complianceProgrammatic advertising and data monetizationThe future of identity resolution in AdTech
Connections