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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New Houston venture studio emerges to target early-stage hardtech, energy transition startups

funding the future

The way Doug Lee looks at it, there are two areas within the energy transition attracting capital. With his new venture studio, he hopes to target an often overlooked area that's critical for driving forward net-zero goals.

Lee describes investment activity taking place in the digital and software world — early stage technology that's looking to make the industry smarter. But, on the other end of the spectrum, investment activity can be found on massive infrastructure projects.

While both areas need funding, Lee has started his new venture studio, Flathead Forge, to target early-stage hardtech technologies.

“We are really getting at the early stage companies that are trying to develop technologies at the intersection of legacy industries that we believe can become more sustainable and the energy transition — where we are going. It’s not an ‘if’ or ‘or’ — we believe these things intersect,” he tells EnergyCapital.

Specifically, Lee's expertise is within the water and industrial gas space. For around 15 years, he's made investments in this area, which he describes as crucial to the energy transition.

“Almost every energy transition technology that you can point to has some critical dependency on water or gas,” he says. “We believe that if we don’t solve for those things, the other projects won’t survive.”

Lee, and his brother, Dave, are evolving their family office to adopt a venture studio model. They also sold off Azoto Energy, a Canadian oilfield nitrogen cryogenic services business, in December.

“We ourselves are going through a transition like our energy is going through a transition,” he says. “We are transitioning into a single family office into a venture studio. By doing so, we want to focus all of our access and resources into this focus.”

At this point, Flathead Forge has seven portfolio companies and around 15 corporations they are working with to identify their needs and potential opportunities. Lee says he's gearing up to secure a $100 million fund.

Flathead also has 40 advisers and mentors, which Lee calls sherpas — a nod to the Flathead Valley region in Montana, which inspired the firm's name.

“We’re going to help you carry up, we’re going to tie ourselves to the same rope as you, and if you fall off the mountain, we’re falling off with you,” Lee says of his hands-on approach, which he says sets Flathead apart from other studios.

Another thing that's differentiating Flathead Forge from its competition — it's dedication to giving back.

“We’ve set aside a quarter of our carried interest for scholarships and grants,” Lee says.

The funds will go to scholarships for future engineers interested in the energy transition, as well as grants for researchers studying high-potential technologies.

“We’re putting our own money where our mouth is,” Lee says of his thesis for Flathead Forge.

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This article originally ran on EnergyCapital.

Houston-based lunar mission's rocky landing and what it means for America's return to the moon

houston, we have a problem

A private U.S. lunar lander tipped over at touchdown and ended up on its side near the moon’s south pole, hampering communications, company officials said Friday.

Intuitive Machines initially believed its six-footed lander, Odysseus, was upright after Thursday's touchdown. But CEO Steve Altemus said Friday the craft “caught a foot in the surface," falling onto its side and, quite possibly, leaning against a rock. He said it was coming in too fast and may have snapped a leg.

“So far, we have quite a bit of operational capability even though we’re tipped over," he told reporters.

But some antennas were pointed toward the surface, limiting flight controllers' ability to get data down, Altemus said. The antennas were stationed high on the 14-foot (4.3-meter) lander to facilitate communications at the hilly, cratered and shadowed south polar region.

Odysseus — the first U.S. lander in more than 50 years — is thought to be within a few miles (kilometers) of its intended landing site near the Malapert A crater, less than 200 miles (300 kilometers) from the south pole. NASA, the main customer, wanted to get as close as possible to the pole to scout out the area before astronauts show up later this decade.

NASA's Lunar Reconnaissance Orbiter will attempt to pinpoint the lander's location, as it flies overhead this weekend.

With Thursday’s touchdown, Intuitive Machines became the first private business to pull off a moon landing, a feat previously achieved by only five countries. Japan was the latest country to score a landing, but its lander also ended up on its side last month.

Odysseus' mission was sponsored in large part by NASA, whose experiments were on board. NASA paid $118 million for the delivery under a program meant to jump-start the lunar economy.

One of the NASA experiments was pressed into service when the lander's navigation system did not kick in. Intuitive Machines caught the problem in advance when it tried to use its lasers to improve the lander's orbit. Otherwise, flight controllers would not have discovered the failure until it was too late, just five minutes before touchdown.

“Serendipity is absolutely the right word,” mission director Tim Crain said.

It turns out that a switch was not flipped before flight, preventing the system's activation in space.

Launched last week from Florida, Odysseus took an extra lap around the moon Thursday to allow time for the last-minute switch to NASA's laser system, which saved the day, officials noted.

Another experiment, a cube with four cameras, was supposed to pop off 30 seconds before touchdown to capture pictures of Odysseus’ landing. But Embry-Riddle Aeronautical University’s EagleCam was deliberately powered off during the final descent because of the navigation switch and stayed attached to the lander.

Embry-Riddle's Troy Henderson said his team will try to release EagleCam in the coming days, so it can photograph the lander from roughly 26 feet (8 meters) away.

"Getting that final picture of the lander on the surface is still an incredibly important task for us,” Henderson told The Associated Press.

Intuitive Machines anticipates just another week of operations on the moon for the solar-powered lander — nine or 10 days at most — before lunar nightfall hits.

The company was the second business to aim for the moon under NASA's commercial lunar services program. Last month, Pittsburgh's Astrobotic Technology gave it a shot, but a fuel leak on the lander cut the mission short and the craft ended up crashing back to Earth.

Until Thursday, the U.S. had not landed on the moon since Apollo 17's Gene Cernan and Harrison Schmitt closed out NASA's famed moon-landing program in December 1972. NASA's new effort to return astronauts to the moon is named Artemis after Apollo's mythological twin sister. The first Artemis crew landing is planned for 2026 at the earliest.

3 female Houston innovators to know this week

who's who

Editor's note: Welcome to another Monday edition of Innovators to Know. Today I'm introducing you to three Houstonians to read up about — three individuals behind recent innovation and startup news stories in Houston as reported by InnovationMap. Learn more about them and their recent news below by clicking on each article.

Emma Konet, co-founder and CTO of Tierra Climate

Emma Konet, co-founder and CTO of Tierra Climate, joins the Houston Innovators Podcast. Photo via LinkedIn

If the energy transition is going to be successful, the energy storage space needs to be equipped to support both the increased volume of energy needed and new energies. And Emma Konet and her software company, Tierra Climate, are targeting one part of the equation: the market.

"To me, it's very clear that we need to build a lot of energy storage in order to transition the grid," Konet says on the Houston Innovators Podcast. "The problems that I saw were really on the market side of things." Read more.

Cindy Taff, CEO of Sage Geosystems

Houston-based Sage Geosystems announced the first close of $17 million round led by Chesapeake Energy Corp. Photo courtesy of Sage

A Houston geothermal startup has announced the close of its series A round of funding.

Houston-based Sage Geosystems announced the first close of $17 million round led by Chesapeake Energy Corp. The proceeds aim to fund its first commercial geopressured geothermal system facility, which will be built in Texas in Q4 of 2024. According to the company, the facility will be the first of its kind.

“The first close of our Series A funding and our commercial facility are significant milestones in our mission to make geopressured geothermal system technologies a reality,” Cindy Taff, CEO of Sage Geosystems, says. Read more.

Clemmie Martin, chief of staff at The Cannon

With seven locations across the Houston area, The Cannon's digital technology allows its members a streamlined connection. Photo courtesy of The Cannon

After collaborating over the years, The Cannon has acquired a Houston startup's digital platform technology to become a "physical-digital hybrid" community.

Village Insights, a Houston startup, worked with The Cannon to create and launch its digital community platform Cannon Connect. Now, The Cannon has officially acquired the business. The terms of the deal were not disclosed.

“The integration of a world-class onsite member experience and Cannon Connect’s superior virtual resource network creates a seamless, streamlined environment for member organizations,” Clemmie Martin, The Cannon’s newly appointed chief of staff, says in the release. “Cannon Connect and this acquisition have paved new pathways to access and success for all.” Read more.