<img src="https://ml.globenewswire.com/Resource/Download/ee8fe270-e4a3-4423-9ecd-1d9b73a7bf08?size=2" nborder="0" align="left" hspace="5" vspace="5" title="AdCellerant_LLC_Logo.jpg" alt="AdCellerant"/>DENVER, Sept. 15, 2026 <a href="https://www.globenewswire.com" target="_blank">(GLOBE NEWSWIRE)</a> -- <a href="https://www.globenewswire.com/Tracker?data=ewriFzQuSyvhPrQCCEEaA3OALkAeK7F_v524b9ojRCj54T5PtdtAt9LKgSlExbIoK_NCRzdxIb3eGVWtdSfyJA==" rel="nofollow" target="_blank" title="">AdCellerant</a>, a leading digital advertising technology and services company, today announced the appointment of veteran product and technology executive Allen Klosowski as Chief Operating Officer. The appointment reflects AdCellerant's continued investment in AI-driven advertising technology, product innovation, and operational scale as the company enters its next phase of growth. Shelby Carlson, AdCellerant's co-founder and longtime Chief Operating Officer, will step away from day-to-day operations at the end of 2026. She will remain a member of AdCellerant’s Board of Directors, where she will continue guiding the company's long-term strategy and governance. Klosowski joins AdCellerant with more than two decades of executive leadership experience across advertising technology, digital media, and connected television. Throughout his career, he has led high-performing organizations and helped scale some of the industry's most influential technology platforms. Most recently, Klosowski served as Senior Vice President at Epsilon, where he shaped strategy and led product teams across digital media, retail media, clean-room data collaboration, and measurement. He also built Epsilon's first AI-based product-operating model to accelerate feature delivery, quality, and customer value. "Over the last thirteen years, we've built AdCellerant into one of the industry's leading technology-enabled advertising platforms by making sophisticated digital marketing accessible to organizations that historically lacked enterprise-level solutions," said Brock Berry, Chief Executive Officer and Co-Founder of AdCellerant. "Allen is exactly the leader we want as we invest in the talent, technology and innovation that will define the next generation of advertising. His experience at Amazon, Epsilon, and SpotX, combined with his operational leadership and strategic vision, positions us to accelerate our product roadmap, strengthen execution across the company, and continue delivering exceptional value to our partners." Prior to Epsilon, Klosowski held leadership roles at Amazon, where he helped develop the company's customer-facing media planning tools for Streaming TV, accelerating the shift of advertiser spend from Linear TV to Amazon's DSP. He also developed products supporting Amazon's omnichannel advertising, programmatic media, identity, and measurement solutions. As Chief Operating Officer, Klosowski will oversee AdCellerant's operational strategy, product organization, and customer operations while partnering with engineering to accelerate technology development. Alongside the executive leadership team, he will help advance product innovation, strengthen operational excellence, and deliver greater value to customers and partners. "AdCellerant has built one of the industry's most compelling platforms for helping media companies, agencies, and brands simplify the complexity of digital advertising while delivering better outcomes," said Allen Klosowski, Chief Operating Officer of AdCellerant. "That customer focus, the pace of innovation behind it, and the outstanding company culture are why I'm excited to join the team. I'm ready to use my experience innovating at scale across SSPs, DSPs, agencies, and publishers to accelerate the next generation of solutions AdCellerant is building for its customers." Over the past year, AdCellerant introduced its revolutionary AI Media Planner within Ui.Marketing, expanded its omnichannel advertising capabilities, and continued investing in automation, workflow efficiency, and platform intelligence that help plan, activate, optimize, and measure digital advertising more effectively. "Helping build AdCellerant has been the greatest privilege of my career," said Shelby Carlson, departing COO, Co-Founder and Board Member. "As we've grown, we've always believed in surrounding ourselves with exceptional leaders who can help take the company to new heights. Allen brings an extraordinary combination of operational excellence, product leadership, and deep industry expertise. I have tremendous confidence in his ability to help lead AdCellerant through its next chapter. I'm incredibly proud of what we've built together over the past thirteen years, and I believe our strongest years are still ahead of us. I'm excited to continue supporting the company's long-term strategy from the Board." About AdCellerant AdCellerant is an award-winning digital advertising technology company helping media organizations, agencies, and enterprise brands simplify and scale digital marketing. Through its proprietary AI-enhanced platform, Ui.Marketing, and expert-managed services, AdCellerant enables partners to plan, activate, optimize, and measure sophisticated omnichannel advertising campaigns through a single, unified solution. By combining innovative technology with deep digital marketing expertise, AdCellerant empowers organizations to deliver measurable business outcomes while simplifying the complexity of today's advertising ecosystem. Learn more at <a href="https://www.globenewswire.com/Tracker?data=Hyh17RB-iq8K3XoCkhap7eWALut-wvI2usAZd5ez8Bw36VU0dmPh2SE-L-dD-Z-EMH9dHmPsMG-jVsWtPgaly-Q5zmpAQRzK4TFHEhGPsMU=" rel="nofollow" target="_blank" title="">www.adcellerant.com</a>. Media Contact: Michael Tilus Broadsheet Communications for AdCellerant michael@broadsheetcomms.com <img alt="" src='https://ml.globenewswire.com/media/NWMzZjM2NGMtNmRiNC00OTMyLWFlMTctYjczMmZjOTFjOGE1LTUwMDE2NDY4MC0yMDI2LTA5LTE1LWVu/tiny/AdCellerant.png' referrerpolicy='no-referrer-when-downgrade' />

AdCellerant Appoints Advertising Technology Veteran Allen Klosowski as Chief Operating Officer to Lead Next Phase of Growth

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