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.


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Key energy leaders to converge in Houston for CERAWeek 2026

where to be

CERAWeek returns this month, March 23-27, and will once again bring leading energy executives and government officials to Houston.

The 44th annual event will again host U.S. Secretary of Energy Chris Wright and U.S. Secretary of the Interior Doug Burgum.

Wright will participate in a plenary session focused on energy policy with Daniel Yergin, conference chair and vice chairman of S&P Global, on March 23. The following day, he will be featured in the Celebrating 10 Years of U.S. LNG reception with Jack Fusso, president and CEO, of Cheniere Energy. Both events are part of the Executive Conference track.

Burgum will participate in a leadership dialogue plenary session with Yergin on March 25. It is also part of the Executive Conference track. Burgum is also chairman of the National Energy Dominance Council, established by President Trump in 2025.

Top energy executives, many of whom are based in Houston, will also be featured prominently at the week-long event. Other speakers include:

  • Bill Blevins, director of grid coordination for the Electric Reliability Council of Texas (ERCOT)
  • Trevor Best, CEO of Syzygy Plasmonics
  • Marie Contour Carrere, executive director of the Rice Sustainability Institute
  • Ryan DuChanois, co-founder and CEO of Solidec
  • Reginald DesRoches, president of Rice University
  • Georgina Campbell Flatter, CEO of Greentown Labs
  • Jim Fitterling, chair and CEO of Dow Inc.
  • Vicki Hollub, CEO of Occidental Petroleum Corp.
  • Renu Katon, chancellor and president of the University of Houston
  • Ryan Lance, chairman and CEO of ConocoPhillips
  • Olivier Le Peuch, CEO of SLB
  • Patrick Pouyanné, chairman and CEO of TotalEnergies SE
  • Adrian Tromel, chief innovation officer and interim VP for Innovation at Rice University
  • Bobby Tudor, founder and CEO of Artemis Energy Partners and chairman of HETI
  • Wael Sawan, CEO of Shell plc
  • Lorenzo Simonelli, chairman and CEO of Baker Hughes Co.
  • Mike Wirth, chairman and CEO of Chevron Corp.
  • Jeremy Pitts, managing director of Activate Houston
  • And many others

This year, CERAWeek will center around the theme of Convergence and Competition: Energy, Technology and Geopolitics.

"Change is inescapable," Yergin said in a news release. "The global energy landscape—and to a large extent the entire global economy—is being fundamentally reshaped by the dual forces of convergence and competition. The race for AI is fusing the energy and technology industries like never before, bringing into sharp relief the need to align energy expansion with sustainable economic growth."

"Yet, the potential for collaboration and innovation is increasingly matched by the risk for collision and conflict in a world marked by geopolitical rivalry, tariffs and fragmented supply chains," he continued. "Reconciling an increasingly complex world with the growing demand for energy that is stable, secure and affordable is a complex reality that CERAWeek 2026 will tackle when global energy leaders meet in Houston."

Key topics of discussion will include:

  • Politics, Economics, Trade and Supply Chains
  • Policy, Regulations and Stakeholders
  • Oil Value Chain
  • Power, Renewables, Generation and Grid
  • AI and Digital
  • Minerals and Mining
  • Electrification Technologies
  • Investment and Financing
  • Chemicals and Materials
  • Business Strategies
  • The Innovation Ecosystem
  • Managing Emissions
  • Low-Carbon Fuels and Mobility
  • Climate and Sustainability
  • Workforce Strategy

The CERAWeek Innovation Agora track, which is the program's deeper dive into technology and innovation, will feature thought leadership on "AI, decarbonization, low carbon fuels, cybersecurity, hydrogen, nuclear, mining and minerals, mobility, automation and more," according to the release.

Agora Hubs will return this year and be divided into three zones: new energies, carbon and climate, and AI. The hubs will feature amphitheater-style sessions and panels. Agora Pods will allow energy startups to showcase their ideas in 20- to 30-minute presentations.

Additionally, CERAWeek will introduce a new program this year on Friday, March 27. Known as Look Forward, it will focus on economics, politics and technology.

See the full agenda for the week here. Find more information and register for the event here.

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This article originally appeared on our sister site, EnergyCapitalHTX.com.

Texas ranks as the No. 13 most innovative state in 2026 study

innovative states

During a SXSW reception March 12 at the Governor’s Mansion in Austin, Gov. Greg Abbott hailed Texas as the No. 1 state for innovation. Personal finance website WalletHub doesn’t see it that way, though.

A new study from WalletHub assigns Texas a No. 13 ranking for innovation among the states and the District of Columbia. D.C. comes out on top, followed by Massachusetts, California, Colorado and Washington. Mississippi appears at the bottom of the list.

Texas earns an innovation score of 49.56, compared with 69.13 for top-ranked D.C. In two broad categories, Texas ranks 12th for human capital and 13th for innovation environment.

To identify the top places for innovation, WalletHub evaluated the 50 states and D.C. by reviewing 25 key indicators of innovation friendliness. The indicators include:

  • Share of STEM professionals.
  • Forecast for Share of STEM professionals
  • Forecast for STEM jobs
  • Eighth-grade math and science performance
  • Concentration of tech companies
  • R&D spending per capita
  • Share of science and engineering graduates age 25 and over
  • Average internet speed
  • Venture capital funding per capita

“The most innovative states are especially attractive to people who have majored in science, technology, engineering and math, or STEM, as they offer abundant career opportunities and investment dollars, both for jobs at existing companies and for startups,” WalletHub analyst Chip Lupo said in the report.

“These states also instill young students with the skills they need to succeed in the current workforce, skills which are useful whether or not they pursue a STEM career,” he added.

Texas zeroes in on semiconductor industry

On the innovation front, Abbott and other state leaders have focused intently on growing the state’s semiconductor industry, which generates roughly $30 billion to $60 billion in economic activity per year. Texas ranks among the top states for semiconductor manufacturing, with major operations in North Texas and Central Texas.

To bolster the industry, Abbott signed the Texas CHIPS Act into law in 2023. The law established the Texas Semiconductor Innovation Fund, which issues grants for semiconductor research, design and manufacturing, and the Texas Semiconductor Innovation Consortium, which advises the governor and state legislators on matters related to the semiconductor sector.

Among the consortium’s appointed representatives are:

  • Joe Elabd, vice chancellor for research at the Texas A&M University System
  • David Staack, deputy vice chancellor for research at the Texas A&M University System
  • Ramanan Krishnamoorti, vice president for energy and innovation at the University of Houston
  • Magesh Rajan, vice president for research and innovation at Prairie View A&M University

Semiconductor companies with a presence in the Houston area include chip manufacturer NVIDIA, which is building an AI supercomputer factory in Houston; Labtopia, a tech staffing firm that does business in the semiconductor sector; Microchip USA, a distributor of semiconductors and other electronic components that opened an office in Kingwood last year; and Infineon Technologies, which designs, develops, and manufactures semiconductors.

The Greater Houston Partnership touts the Houston area’s track record as an innovation hub.

“As a home to world-changing innovations and a talented labor pool, Houston has been an attractive region for innovation and startups across all key industries for years,” the partnership says, “and as a major player as a center of activity for the next generation of innovators and entrepreneurs.”

Houston fuels energy innovation

As for energy innovation in the Houston area, Abbott last month announced a 455-megawatt, $617 million natural gas plant that Houston-based NRG Energy is building at its Greens Bayou facility in north Harris County is now a designated project under the Texas Jobs, Energy, Technology, and Innovation (JETI) program. JETI offers economic incentives for qualifying projects.

The NRG plant is expected to begin generating power for the Electric Reliability Council of Texas (ERCOT) in 2028.

Other energy innovators in the Houston area include Chevron, ExxonMobil, Occidental’s 1PointFive subsidiary, Schneider Electric, Shell, AB Energy USA, Fervo Energy, Solugen and Syzygy Plasmonics.

One promising area for energy innovation in Houston is carbon capture, utilization, and sequestration (CCUS). A new study from the Houston Energy Transition Initiative (HETI) and Deloitte Consulting says the Houston area is positioned to take a leading role in the development of CCUS, thanks to the region’s chemical and refining industries, energy infrastructure, energy-heavy workforce and access to global markets.

“With supportive policy, continued innovation, and strong industry partnerships, we can accelerate [CCUS] deployment, create new low-carbon value chains, and ensure Houston remains at the forefront of the global energy transition,” said Jane Stricker, HETI’s executive director and senior vice president of energy transition.

Uber rolls out women-only ride preferences to Houston users

Women Preferences

Houston women riders and drivers can now be matched to other women on the Uber app. The ride-hailing giant has expanded its pilot program nationwide in response to customer safety concerns.

“When women riders and drivers told us they wanted more control over how they ride and earn, we listened,” wrote Uber in a blog post announcing the move. “That feedback led to Women Preferences, features designed to give women the choice to ride with other women. Since our first pilots last summer, we’ve heard just how much that choice matters — from feeling more comfortable in the back seat to more confident behind the wheel.”

According to Uber, passengers can request to be matched with a woman driver by requesting an on-demand ride, scheduling a trip in advance, or setting a preference within the ride app. If wait times are longer than anticipated, the rider can opt to be paired with a driver of any sex.

Uber says it began offering the rides in 2019, after women in Saudi Arabia gained the right to drive. Since then, it has rolled out the program in Europe, Latin America, Australia, and Africa — although in some countries, only drivers can make the match.

The move forward on Women Preferences comes despite a pair of lawsuits aimed at Uber and its main competitor, Lyft. According to Time reporting, the plaintiff’s lawyers argue that women-only rides unfairly limit the volume of rides for male drivers and reinforce gender stereotypes about men.

Lyft rolled out its similar program, Women + Connect, in 2023. The initiative is slightly more expansive than Uber’s preferences, allowing both women and nonbinary people to participate.

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This article originally appeared on CultureMap.com.

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