At 20, Arthur Leopold stood on the floor of Invesco Field as Barack Obama accepted the Democratic presidential nomination. The young New York delegate looked around at the bright signs, the television cameras and a crowd of more than 80,000, then supplied the only reasonable sentence: “This is the most exciting day of my life. Can you believe this!”
The delight matters. Before Leopold became an advertising executive, before Cameo and Agentio and the tidy language of marketplaces, he was an organizer watching a mass of people form around an idea. His early résumé reads like somebody had mixed a civics textbook with a startup accelerator. As a teenager, he interned for Representative Carolyn Maloney and managed her 2006 reelection campaign. In 2007, he helped host a large Obama fundraiser in Manhattan. In 2008, he joined Obama's finance committee, raised money for another congressional candidate and became a New York delegate.
Politics gave him an early education in attention. A crowd can appear quickly. Institutions tend to arrive later, carrying clipboards. Leopold's subsequent career has been a study of that delay - first in social media, then in celebrity access, and now in creator advertising.
Find people who want to reach one another, remove the awkward middle, and give the exchange a system.
An apprenticeship in connection
Leopold graduated from Duke University in 2012 after studying political science and Markets and Management. As an undergraduate, he also served on the executive committee of the Friends of the Duke University Libraries, an agreeably analog detail in a career about digital attention. His first day at Twitter came that year. By 2017 he was selling enterprise social software at Sprinklr, explaining how brands could understand and reach audiences across platforms.
Then came the more consequential bet. Steven Galanis and Martin Blencowe were building Cameo, where fans could pay public figures for personalized video messages. Leopold saw the idea, invested in the friends-and-family round and joined as chief operating officer and first employee. He described the underlying shift neatly: selfies were becoming the new autographs.
The product made fame feel less architectural. A velvet rope, a booking agent and a formal appearance could shrink into a phone screen and a birthday greeting. As COO, Leopold helped build the talent organization from the ground up and onboard tens of thousands of personalities. He later became chief business officer, created Cameo for Business and, in February 2022, was named president.
Cameo also exposed a more expensive kind of demand. Brands wanted the same direct access that fans enjoyed. They wanted creators in campaigns, but celebrity advertising still moved by negotiation, paperwork and calendar. Cameo for Business made that process easier. Leopold could see the larger market waiting behind it.
His five and a half years at Cameo amounted to a marketplace apprenticeship: recruit supply, awaken demand, solve the chicken-and-egg problem, protect the experience and keep both sides returning. When he stepped down as president in January 2023, remaining a senior advisor, those mechanics travelled with him.
Sunday encounter, Tuesday company
Agentio began with excellent calendar efficiency. Leopold ran into Jonathan Meyers on a Sunday. They had lunch on Monday. By Tuesday they had agreed to start a company. Leopold brought the commercial and marketplace experience from Cameo. Meyers brought engineering experience from Spotify, where he had led an automated content-marketing initiative using machine learning.
They met just as generative AI was becoming capable of understanding video, language and context with unusual depth. Their shared question was practical: could software make buying creator ads feel as ordinary as buying ads on Meta or Google?
The old workflow had enough friction to warm a small apartment. A marketer would find a creator, contact an agent, negotiate a price, review brand-safety concerns, trade contracts, approve a script, track a post and then attempt to measure the result. One campaign could involve hundreds of emails and take months to deploy. For creators, the uncertainty ran in reverse: irregular offers, opaque pricing and no dependable path to the budgets already flowing through digital media.
Agentio turned that choreography into a two-sided marketplace. Creators list upcoming inventory. Brands describe the audience and outcome they want. The platform uses AI to help match the parties, recommend bids, manage negotiation and contracts, oversee delivery and follow performance. It launched first around YouTube integrations, where a creator reads or performs an advertisement inside a video.
The useful subtlety is that Agentio is automating the coordination around human taste. Leopold argues that creators remain the “CMOs to their audience.” They know the audience's references, timing and tolerance for a sales pitch. An efficient system that made every creator sound like a banner ad would efficiently destroy the thing being purchased.
The real estate inside a video
Leopold's favorite contrast is between buying real estate and renting reach. A feed ad disappears when the campaign stops paying. A YouTube integration remains inside the video, collecting views and clicks as the audience discovers it over time. Agentio's analysis of more than 10,000 integrations found that about 40 percent of views and 30 percent of clicks arrived more than 30 days after publication.
That long tail changes measurement. A hurried report can mistake an asset for a flop while it is still finding an audience. Repeated partnerships matter, too. When a creator returns to the same brand, the audience gains familiarity and the performance data becomes more useful. Leopold advocates a portfolio across large, mid-sized and smaller creators instead of one glamorous bet. Advertising becomes less like casting a spokesperson and more like managing media.
The company found willing investors. Agentio announced a $4.25 million seed round in November 2023. A $12 million Series A led by Benchmark followed in November 2024. One year later, Forerunner led a $40 million Series B, bringing the announced total to $56 million and the valuation to $340 million. Agentio said it had grown fivefold year over year and served more than 100 enterprise brands during 2025.
Fundraising is evidence of conviction, not the finish line. The more revealing number may be headcount. Agentio reached its Series B with roughly 35 people and said it had barely touched the Series A. Leopold's memorable hiring philosophy is that if you starve a team, it will build a farm - provided the people are resourceful, ambitious and hungry.
The metaphor has a mischievous edge, but the operating idea is talent density. Leopold talks about “five-quarter” people who enlarge a role, reduce problems to first principles and treat speed as a choice. Small teams are not automatically virtuous. A lean company can simply be a crowded one. The test is whether constraint produces leverage for customers. Agentio points to campaign budgets that once took six months to clear moving through its system in hours.
Trust gets a measurement system
In 2026, Agentio extended its argument beyond YouTube and into Meta Partnership Ads. The format pairs a creator's identity with paid distribution, allowing a brand to carry a familiar voice into the measurement rails of a large ad platform. Agentio analyzed $130 million in spending across 65,000 such ads and found creator-led versions produced more clicks and conversions at lower acquisition cost than the same creative presented only through a brand account.
Leopold calls the mechanism a transfer of trust. A creator may have spent a decade learning what an audience finds useful, funny or credible. The brand borrows a portion of that relationship, but it cannot manufacture it. Measurement helps the budget move; creative restraint keeps the audience from leaving.
This is the balancing act inside Agentio. It must standardize without sterilizing. It must give marketers control while leaving creators enough room to sound like themselves. It must treat trust as economically valuable without pretending it is merely another field in a database.
Leopold has arrived at this puzzle by an oddly coherent route. Political organizing taught him that participation depends on personal belief. Twitter showed how quickly voices gather an audience. Cameo proved that direct access could support a marketplace. Agentio asks whether those relationships can support a media system.
The young delegate in Denver was amazed that a crowd could assemble around a candidate. The founder in New York is concerned with what happens after the crowd arrives. Attention moved. Creators earned it one video at a time. Now come the institutions, clipboards in hand, hoping the new rails can catch up without flattening the people who laid the track.