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Brian Mandelbaum

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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.

Last updated Jun 6, 2026 by the ATDb Editorial Team

Role
CEO
Company
Attain
Based
Chicago, Illinois, United States
Connections
1
Years in industry
15 years

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.

Career

  • CEO

    Clearstream.tv · 2014-2018

  • Senior Leadership

    Various AdTech Companies · Prior to 2014

Expertise & education

Expertise

First-Party DataConsumer Data MonetizationProgrammatic AdvertisingPrivacy-Compliant AdvertisingIdentity ResolutionConsumer Engagement PlatformsData PartnershipsCookieless Targeting

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

Recognition

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
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