Houston founder shares how he's using tech to make digital media more effective and equitable

houston innovators podcast episode 173

This month, Mark Walker is celebrating his company's one year anniversary of going public — only the ninth Black-founded business to accomplish this feat on a U.S. stock exchange. Photo courtesy

After working in both sides of the advertising world, Mark Walker thought he could reimagine a platform that would be more efficient and equitable.

Walker co-founded his company, Direct Digital Holdings, an adtech platform, after serving in several roles — from an early hire at Houston digital media startup Questia to business development director at NRG Energy and COO of EBONY Media. He shares on the Houston Innovators Platform how he took this experience in tech, advertising, and media to create his company's platform.

"NRG Energy gave me a top-down view of the value chain, and Ebony gave me a bottoms-up view of the value chain of how media is purchased," Walker says on the show. "At Direct Digital Holdings, we help companies buy and sell media — and we leverage technology to do it. It's really the culmination of both of those experiences."

With over 30,000 publishers on its platform, Direct Digital makes it easier for its core customers — middle market companies looking to buy into the digital media ecosystem — to tap into these opportunities without the tech know-how they might otherwise need. Walker explains that at EBONY, he saw how small to midsize publications — especially the multicultural ones — were being left out on the ad selling side of the equation. The Direct Digital platform bridges the gap on each end.

Founded in 2018 in partnership with Keith Smith, who went through similar professional experiences, Direct Digital went public exactly one year ago after growing the company through strategic M&A activity. Walker says the decision to IPO made the most sense for his company — though it wasn't an easy process. Direct Digital is only the ninth company founded by a Black entrepreneur to go public on a US stock exchange.

"If you think the process is hard — it actually is," Walker says on the journey to IPO. "We were a privately held company, and we knew we had a good growth trajectory and we looked a couple different options. We decided to go public in a very traditional way."

Walker explains there were some risks involved, but the co-founders ultimately decided to shy away from adding in investors who might not have the same ideas for the company's future.

Direct Digital has been a Houston company from the star — despite the city not being home to a booming adtech ecosystem. Instead, Houston — with its collection of Fortune 500 companies and rich diversity — has allowed the business to stand out.

"If you look at and reflect on how our company has been built — from our board of directors to our leadership and management team — we're a majority minority organization all the way across the board," Walker says. "Diversity is very important to us. It's the lifeblood of our business — especially because we're serving publishers in those communities in big way. And moreso, we think you get the best product, thoughts, and ideas from a diverse workforce, and Houston fits right into that mold for us."

Walker shares more about his company's future, advice on IPO, and what all he's watching in adtech — from AI to streaming — on the podcast. Listen to the interview below — or wherever you stream your podcasts — and subscribe for weekly episodes.


Ad Placement 300x100
Ad Placement 300x600

CultureMap Emails are Awesome

Property Showcase

7+ can't-miss Houston business and innovation events in May

where to be

Editor’s note: Houston is living up to its nicknames as Space City and the Energy Capital of the World this month with a lineup of insightful talks, pitch days and industry conferences. Plus, there are opportunities to network over crawfish, learn about brain health and more. Here’s what not to miss and how to register. Please note: this article may be updated to add more events.

May 7 – Ion Block Party and Crawfish Boil

Head to this special edition Block Party, featuring a crawfish cook-off competition among the Ion’s businesses. Competing teams include Transwestern, Microsoft, Rice Alliance, Rice Nexus, South Main Baptist, Per Scholas, Industrious and many others. Taste test crawfish while supplies last, and sip a complimentary drink from Second Draught.

This event is Thursday, May 7, from 4-7 p.m. at the Ion. Register here.

May 12 – Why the Next Decade of Breakthrough Brain Tech Matters For You, and What to Do About It

Hear from Matias Serebrinsky, co-founder and general partner of San Francisco-based PsyMed Ventures, at this talk presented by EO Houston. Serebrinsky will discuss why founders are disproportionately affected by brain health issues and look at breakthrough brain and mental health tech.

This event is Tuesday, May 12, from 11:20 a.m.-1 p.m. at Tony's on Richmond Avenue. Register here.

May 18-19 — Geothermal Transition Summit North America

This two-day summit serves as the meeting point for the geothermal and oil and gas industries and will focus on geothermal energy, including scaling plants and navigating state regulations. The event promises 40 expert speakers, 15 exhibition spaces, and networking opportunities with 250 industry decision makers.

This event begins May 18 at Norris Conference Center. Register here.

May 19 – IOT Innovation Day

IoT Innovation Day will present a series of fast‑paced, 15‑minute tech talks focused on the future of connected devices. These sessions feature insights from founders, engineers, product innovators and industry leaders. Attendees are also invited to sign up to present their own tech talk showcasing their expertise, startup or solution.

This event is Tuesday, May 19, from 10 a.m.-6 p.m. Register here.

May 20-21 — ESF North America

ESF North America returns for its 5th edition, under the theme of “innovation and adaptation.” Attendees will explore how technology, innovation, and collaboration can drive a resilient, competitive refining and chemicals industry.

This event begins May 20 at The Westin Oaks Houston at the Galleria. Register here.

May 21 – AI + Energy Sector Pitch Day

Hear from startups powering the AI boom or using AI to support the energy transition at Greentown's latest installment of its Sector Pitch Day series. Brian Walker, program manager for emerging technologies in the U.S. Department of Energy’s Building Technologies Office, will present the keynote address. Six Greentown startups will present pitches, as well as others from IMPEL, a DOE tech-to-market program, and more. Stick around for a networking happy hour.

This event is Thursday, May 21, from 1:30-6:30 p.m. at the Ion. Register here.

May 28 – NASA Stories at the Ion: A Conversation with NASA’s Artemis II Orion Vehicle Manager Branelle Rodriguez

NASA’s Artemis II Orion Vehicle Manager Branelle Rodriguez will discuss what it took to ready the spacecraft for its mission and return to Earth at this special installment of NASA Stories. Rodriguez will share insights on Orion’s high-speed reentry, the views of the Moon and Earth witnessed by the crew, and what’s next for Orion on NASA’s upcoming Artemis missions in 2027 and 2028. Complimentary breakfast and networking take place before each talk.

This event Thursday, May 28, from 8:30-10 a.m. at the Ion. Register here.

May 28 – NASA Tech Talks: Texas-France Space Hub Business Accelerator Initiative

NASA Tech Talks is partnering with the Rice Space Institute (RSI) this month to host the second cohort of the Texas-France Space Hub in Houston. The hub aims to unite academic institutions and private enterprises to expand commercial space presence in both countries. Startups from the hub will present during the event, followed by drinks and networking at Second Draught.

This event Thursday, May 28, from 6-7 p.m. at the Ion. Register here.

New TMC partnership aims to grow Houston’s biomanufacturing workforce

workforce partnership

Houston is a frontrunner in the race to introduce and manufacture advanced therapeutics to the medical world. A new agreement between the Texas Medical Center (TMC) and San Jacinto College (SJC) aims to speed more experts and their technologies towards the finish line.

Earlier this month, the world's largest medical center and the nation’s second-ranked community college announced their new partnership that will set students on a path towards careers not only in life sciences in general, but also in pharmaceutical and biomanufacturing specifically.

SJC already has programs in those majors—its first graduates are now joining the workforce—but working with TMC will help the college recruit new students, as well as aid in enrollment and participation. Thanks to this collaboration, SJC students will benefit from more experiential learning and be able to transition more smoothly into the next steps in their training.

“Houston is a premier global hub for life sciences and biotechnology, and the talent we need to advance therapeutic drugs, diagnostics, and cell and gene therapy is already here,” William McKeon, the TMC’s president and CEO, said in a news release. “With more companies choosing to establish their headquarters in Houston and the daily breakthroughs happening across the TMC campus, partnering with San Jacinto College is an important step toward sustaining that momentum and unlocking even greater innovation and growth through the promising talent that already exists within our state.”

The partnership is currently slated to last two years, but the institutions have the option to extend after that.

For students, their journey to becoming scientists will likely start with Biopath @ TMC, a program that introduces high school students to biomanufacturing careers and what it takes to pursue one. Since its inception two years ago, the program has worked with more than 2,000 students around Harris County.

“This partnership exemplifies San Jacinto College’s ability to design and deliver programs that align with current workforce demands while opening doors for untapped talent across the Houston region,” Brenda Hellyer, SJC chancellor, said in the release. “TMC is a key industry leader in our region, and San Jacinto College has a unique global curriculum that provides the foundation and skills required for students to succeed and graduates to thrive in meaningful careers that will contribute to the innovation and advancement of the life sciences.”

Thanks to this new collaboration, more of Houston’s biomanufacturing workforce will soon be locally grown.

Houston legacy planning platform secures $2.5M investment, adds to board

fresh funding

Houston-based Paige, a comprehensive life planning and succession software company, has secured a $2.5 million investment to expand the AI-driven tools on its platform.

The funding comes from Alabama-based 22nd State Banking Company, according to a news release. Paige says it will use the funding to expand automation, AI-driven onboarding and self-service tools, as well as add to its sales and customer success teams.

The company was originally founded by CEO Emily Cisek in 2020 as The Postage and rebranded to Paige last year. It helps users navigate and organize end-of-life planning with features like document storage and organization, password management, and funeral and last wishes planning.

“Too many families are left trying to piece together important information during some of the hardest moments of their lives,” Cisek said in the news release. “This investment allows us to accelerate the next phase of growth for Paige by improving the product and expanding support for our members, our financial institution partners and the communities they serve,”

In addition to the funding news, the company also announced that 22nd State Banking CEO and President Steve Smith will join Paige's board of directors.

“We believe banking should be grounded in relationships and built around the real needs of the people and communities we serve. Paige brings something deeply relevant to that mission," Smith added in the release. "It helps families prepare for the future in a practical and meaningful way, and it gives the banking community new pathways to support customers through important life transitions.”

Paige estimates that $124 trillion in assets will change hands through 2048. Yet about 56 percent of Americans do not have an estate plan.

Read more on the topic from Cisek in a recent op-ed here; or listen to InnovationMap's 2021 interview with her here.

View All Listings