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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Here's how much it takes to earn a top 1 percent salary in Texas

wealthy lifestyle

With two Houston-area neighbors cashing in among the most wealthy suburbs in America, Houstonians may be wondering how much money they need to make to secure a place in the top one percent of earners. According to a new study from SmartAsset, the pre-tax salary required to be considered one of the highest earners in Texas amounts to $762,090 in 2024.

Texas has the 14th highest pre-tax salary needed to be considered in the top one percent of earners in the U.S. for the second year in a row. Texas' income threshold is not too far off from the national average, which is $787,712.

The study further revealed 126,128 Texans are within the top one percent of earners. For more context, the U.S. Census Bureau says over 30 million people lived in Texas as of 2022, and Houston's population grew to 2.3 million people in 2023.

Connecticut continues to lead the nation with the highest income threshold required to be in the top one percent, with residents needing to make over $1.15 million pre-tax.

To determine the income needed to be in the top one percent of earners in each state, SmartAsset analyzed 2021 IRS data for individual tax filers, which is the most recent year where data was available. Income data was then adjusted to June 2024 dollars.

Compared to SmartAsset's 2023 report, Texans now need to make $130,241 more in 2024 to maintain their status as one of the highest earners in the state. Last year, the income threshold was $631,849.

If Houstonians aim to be within the top five percent of earners in Texas, the pre-tax income threshold is drastically lower, at $280,676. However, for many Houston residents, achieving even a "middle class" status means making between $40,280 and $120,852 a year.

Meanwhile, the study says the median income in the U.S. comes out to roughly $75,000, and half of Americans are making even less than that. The income disparity is plainly obvious when high-income earners make (at a minimum) 10 times more than the national median income.

The report goes on to say top-earning Americans make up a "disproportionately large part of the tax base," as their income results in paying a 37 percent federal tax bracket rate. (That is, if these high earners are even paying taxes in the first place, considering America's wealthiest are already evading over $150 billion a year in taxes.)

"While state and local level taxes may impact the spread of high earners in those areas, the cost of living can also be drastically different nationwide," the report said. "As a result, what it takes to be considered a top one percent income earner can differ by over $500,000 from state to state."

The top 10 states with the highest thresholds to be considered in the top one percent of earners in the U.S. are:

  • No. 1 – Connecticut ($1,152,254)
  • No. 2 – Massachusetts ($1,113,662)
  • No. 3 – California ($1,035,673)
  • No. 4 – Washington ($989,649)
  • No. 5 – New Jersey ($975,645)
  • No. 6 – New York ($965,645)
  • No. 7 – Colorado ($865,700)
  • No. 8 – Florida ($852,206)
  • No. 9 – Wyoming ($843,121)
  • No. 10 – New Hampshire ($811,098)
The full report can be found on smartasset.com

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This article originally ran on CultureMap.

Houston fintech co. offers new grants, chemist scores funding for cancer treatment, and more top stories

top stories

Editor's note:Let's roundup the most-read Houston innovation news from the week. Trending Houston tech and startup articles from InnovationMap and its daily newsletter included a Rice professor securing support for his cancer treatment, an energy company raising funding, and more.

Houston-based equitable entrepreneurship tech platform expands programs

In partnership with top organizations — like Progressive, Antares Capital, Wells Fargo, and FedEx — Hello Alice has added new offerings for its 2024 Boost Camp programs. Photo via Pexels

Fresh off of celebrating the dismissal of a lawsuit from former Trump Administration officials, Hello Alice is expanding some of its offerings for entrepreneurs.

In partnership with top organizations — like Progressive, Antares Capital, Wells Fargo, and FedEx — Hello Alice has added new offerings for its 2024 Boost Camp programs, a mix of skill-building support and grant opportunities.

“We are fortunate to continue working with great enterprise partners who share our commitment to supporting Main Street through crucial grants and mentorship programs,” Carolyn Rodz, CEO and co-founder of Hello Alice, says in a news release. Continue reading.

Houston chemist lands $2M NIH grant for cancer treatment research

The funds were awarded to Han Xiao, a scientist at Rice University.

A Rice University chemist has landed a $2 million grant from the National Institute of Health for his work that aims to reprogram the genetic code and explore the role certain cells play in causing diseases like cancer and neurological disorders.

The funds were awarded to Han Xiao, the Norman Hackerman-Welch Young Investigator, associate professor of chemistry, from the NIH's Maximizing Investigators’ Research Award (MIRA) program, which supports medically focused laboratories. Continue reading.

Power grid tech co. with Houston HQ raises $25M series B

Heimdall supplies software and sensors for monitoring overhead power lines. Photo via heimdallpower.com

A Norway-based provider of technology for power grids whose U.S. headquarters is in Houston has raised a $25 million series B round of funding.

The venture capital arm of Polish energy giant Orlen, Norwegian cleantech fund NRP Zero, and the Norway-based Steinsvik Family Office co-led Heimdall Energy's round. Existing investors, including Investinor, Ebony, Hafslund, Lyse, and Sarsia Seed, chipped in $8.5 million of the $25 million round.

“This funding gives us fuel to grow internationally, as we continue to build our organization with the best people and industry experts in the world,” Jørgen Festervoll, CEO of Heimdall, says in a news release.Continue reading.

Houston engineers develop breakthrough device to advance spinal cord treatment

The probe or sensor, known as spinalNET, is used to explore how neurons in the spinal cord process sensation and control movement. Photo by Jeff Fitlow/Rice University

A team of Rice University engineers has developed an implantable probe over a hundred times smaller than the width of a hair that aims to help develop better treatments for spinal cord disease and injury.

Detailed in a recent study published in Cell Reports, the probe or sensor, known as spinalNET, is used to explore how neurons in the spinal cord process sensation and control movement, according to a statement from Rice. The research was supported by the National Institutes of Health, Rice, the California-based Salk Institute for Biological Studies, and the philanthropic Mary K. Chapman Foundation based in Oklahoma.Continue reading.

Houston neighbor ranks as one of America's most livable small cities

Missouri City is the No. 4 most livable small city in Texas, and ranked No. 77 nationwide. Photo Courtesy Missouri City

Some Houston suburbs stick out from the rest thanks to their affluent residents, and now Missouri City is getting time in the spotlight, thanks to its new ranking as the No. 77 most livable small city in the country.

The tiny but mighty Houston neighbor, located less than 20 miles southwest of Houston, was among six Texas cities that earned a top-100 ranking in SmartAsset's 2024 " Most Livable Small Cities" report. It compared 281 U.S. cities with populations between 65,000 and 100,000 residents across eight metrics, such as a resident's housing costs as a percentage of household income, the city's average commute times, and the proportions of entertainment, food service, and healthcare establishments.Continue reading.

Houston hospitals recognized as best in state, nation in annual report

better than all the rest

Houston’s University of Texas MD Anderson Cancer Center has retained its U.S. News & World Report crown as the best cancer hospital in the U.S.

In the same ranking, Houston Methodist Hospital once again came out on top as the best hospital in Texas. Last year, the hospital shared the top spot. Baylor St. Luke’s Medical Center ranked No. 4, followed by No. 5 Memorial Hermann Hospital.

The accolades appear in U.S. News’ 2024-25 ranking of the country’s best hospitals. Each hospital also ranked among various specialties, such as orthopedics; cardiology, heart, and vascular surgery; cancer; and neurology and neurosurgery.

Since U.S. News introduced its annual hospital survey in 1990, MD Anderson has been ranked one of the two best U.S. hospitals for cancer care. It has maintained its No. 1 ranking for 10 consecutive years.

“At MD Anderson, our mission is clear: to end cancer,” Dr. Peter WT Pisters, president of MD Anderson, says in a news release. “This ranking reflects our relentless commitment to excellence in patient care, research, prevention, and education.”

MD Anderson also ranked highly in three specialties:

  • No. 2 for ear, nose, and throat.
  • No. 9 for urology.
  • No. 14 for gastroenterology and GI surgery.

“The consistent top national recognitions [that] MD Anderson receives for delivering compassionate, evidence-based care is a testament to our dedication to those we serve,” Pisters says.

Elsewhere at the Texas Medical Center, Houston Methodist Hospital was named the No. 1 hospital in Texas for the 13th year in a row. Also, it was lauded as one of the country’s 20 best hospitals for the eighth time.

Along with the general ranking, Houston Methodist Hospital scored high marks in 10 specialties. These include diabetes and endocrinology (No. 6), gastroenterology and GI surgery (No. 7), and pulmonology and lung surgery (No. 8).

Meanwhile, four Houston Methodist community hospitals ranked well in Texas:

  • Houston Methodist The Woodlands Hospital (No. 8).
  • Houston Methodist Sugar Land Hospital (No. 9).
  • Houston Methodist Baytown Hospital (tied at No. 18).
  • Houston Methodist Willowbrook Hospital (tied at No. 23).
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