Mariner Logistics has named Justin Turner as its new chief executive officer, placing the integrated, asset-backed fourth-party logistics (4PL) provider in the hands of an executive who has spent the past decade scaling freight brokerages and transportation technology companies.

Based in Coppell, Texas, Mariner Logistics operates trucks, warehouses, managed transportation services, and a proprietary technology stack under a single roof. That combination is uncommon in a logistics sector where most 4PLs operate as non-asset-based intermediaries, relying on third-party capacity rather than owned equipment. The company serves manufacturing, aerospace, and defense customers, along with an expanding portfolio of data center freight — a vertical seeing surging demand as hyperscale operators race to build out infrastructure for cloud computing and AI workloads.

"Mariner has built something rare in this industry: an asset-backed 4PL with a real infrastructure, real warehouses, and the verification and visibility technology shippers now demand," Turner said.

From Coyote Dispatcher to Mariner Logistics CEO

Turner's career in freight began on the floor of a brokerage. "I was an early employee at Coyote and started as a dispatcher, tracking and tracing shipments every day," he said in an interview with FreightWaves.

His seven years at Coyote Logistics included a central leadership role during the company's $1.8 billion acquisition by UPS in 2015, one of the largest freight brokerage deals of that era and a transaction that underscored how major parcel carriers were racing to build out freight brokerage capabilities. He subsequently joined GlobalTranz as vice president of sales, then led sales and customer success at Atlanta-based STORD. As chief revenue officer at Flock Freight, Turner helped scale the company's revenue from approximately $10 million to more than $500 million while it raised over $400 million in venture capital. Flock Freight's shared-truckload pooling model attracted significant investor attention during the freight-tech funding boom. Most recently, he served as chief commercial officer at Terawatt, an electric vehicle charging infrastructure developer for Class 8 trucks. He began his career in logistics management with the U.S. Army.

Why Mariner Built the Sentinel Protocol

Sentinel Protocol, Mariner's multi-source carrier and driver verification standard, originated as a cargo security requirement rather than a legal compliance measure.

"We have some work today that we focus on in high-value, high-security freight. And because of that, we built Sentinel because it's just a requirement," Turner said. "When you're dealing with cargo values in the millions, you need to have a real protocol for how you handle chain of command."

The standard applies to every shipment Mariner coordinates and requires more than a Federal Motor Carrier Safety Administration (FMCSA) rating pulled at the time of booking. "It's not just a check-in and FMCSA safety rating," he said. Sentinel timestamps due diligence across the entire lifecycle of a load rather than only at the point of sale.

Where Automation Ends and Human Judgment Begins

Mariner continuously scores carriers and lanes rather than evaluating them once at signup. "We're pulling live data from multiple intelligence sources. So a carrier or a lane isn't scored once and forgotten. It's a constant update," Turner said.

Automation handles volume, but it does not replace human judgment.

"The vast majority of the qualification process that we have today happens without a human touching them, but then there's a really meaningful portion where a person has to sign off. And that stuff matters," he said.

A second technology investment, the Vibe Engine, is an artificial intelligence layer developed with Vibe Software that integrates into shippers' existing systems to automate spot procurement and carrier matching. Both Sentinel and the Vibe Engine feed into Mariner Live, the company's visibility platform.

Inside Mariner's Trucks, Warehouses, and Managed Transportation

Mariner operates more than 300 owned tractors, over 800 owned trailers, and approximately 1 million square feet of warehouse space. Turner said the tractors run through sister company Gulf Relay, a Clinton, Mississippi-based carrier founded in 2010, and placed the Dallas/Fort Worth warehouse footprint at 1.5 million square feet.

The warehouses are not a peripheral business. Mariner serves healthcare, financial services, manufacturing, retail, government, and technology clients, with a freight mix that leans toward heavy industry.

"We support a variety of industries from manufacturing, industrial goods, aerospace and defense. We have some work that we do with the data center space," he said. "For us a differentiator is the combination of the assets and the real infrastructure on top of our technology."

Mariner also coordinates more freight than its own fleet can carry, leaving the majority of loads on third-party equipment. "We guarantee that discipline because owning some of the network just doesn't let us off the hook on the rest of it," Turner said.

What Montgomery v. Caribe Changed for Carrier Vetting

The legal landscape for freight brokers shifted significantly in 2025. The Supreme Court ruled unanimously on May 14 in Montgomery v. Caribe Transport II that federal law does not preempt state negligent hiring claims against freight brokers, eliminating a preemption defense the industry had relied on for years. A Dallas County jury subsequently returned a $604 million verdict that assigned C.H. Robinson 23% responsibility.

For Mariner, a protocol originally built to protect cargo turned out to produce the kind of records a courtroom expects.

"The courts are now asking what you knew, when you knew it, and what you did with that information before the freight ever moved," Turner said. "So that snapshot alone doesn't answer those three questions."

The practice now most exposed is the one-time carrier check. "For a long time courts let that hold up," he said. "Those one-time checks, that's going to be very difficult to hold up right in front of a jury."

Turner attributed the industry's gap to the demands of scale rather than a lack of effort. "When you're moving thousands and thousands of shipments a day, you're trying to grasp the economies of scale with the technology and the team, but there's a lot that can fall in between the cracks," he said. "I do believe it would be challenging for the majority to deliver that type of documentation if asked today."

Sentinel Protocol is also a product Mariner markets to shippers. The brokers' own trade group has echoed the concern: the Transportation Intermediaries Association petitioned FMCSA in June for a federal carrier selection standard, telling the agency that brokers face an "untenable burden" judging safety with "potentially suspect data." More than 90% of authorized carriers operate without an FMCSA safety rating.

What the New CEO Plans Next

Turner takes the helm as the freight market emerges from a prolonged downturn that began in 2022 after a pandemic-era shipping boom. ACT Research's most recent June For-Hire Trucking Index placed its Freight Rate Index at 70.2, among the strongest readings in nearly 17 years, with driver availability near a five-year low.

"All of the industry has gone through a really troubling four-year deflationary cycle, and we're out of it today, but it's not without its own challenges," Turner said.

He wants shippers to understand that every component of the operation reports to a single screen. "If it's in our network, if it's in an external network, if it's in our facility or if it's in another facility, they get the same visibility and transparency throughout one platform, and that's called Mariner Live," he said.

"I want them to know us as a great commercial organization that we do what we say we're going to do," Turner said.