by Sarah Grace Taylor, Nashville Banner
March 5, 2026
Before Mark Green abruptly retired from the U.S. House of Representatives last summer, the embattled congressman and his lobbyist business partner allegedly used trade information from one of the partner’s clients to compete for a lucrative fuel agreement with the Guyanese government.
Last spring, Green established a company called Prosimos alongside lobbyist and corporate attorney Marc C. Hebert.
In June, Green announced his retirement from Congress, less than six months into his fourth term, which he won in a 2024 campaign riddled with personal drama surrounding his divorce, an alleged affair and tensions among his family. In July, he stepped down, triggering a frenetic special election to replace him in the seat that represents a significant chunk of the midstate.
While campaigning for his successor, Rep. Matt Van Epps, Green told the Banner that Prosimos was designed to compete with Chinese companies for international business, noting “The motto is basically, ‘If an American company doesn’t do it, a Chinese company will.’”
“Why not help American companies go overseas — I’ll make a little bit of money doing it, OK, it’s a for-profit entity — but I’m not taking the U.S. flag out of my rucksack, right?” Green said at a September event for Van Epps in Nashville. “You don’t serve the country for 36 years in some capacity and [not] still want to do some good.”
At the center of Prosimos’ burgeoning portfolio is Guyana, a South American country which Green visited repeatedly during his last stint in office, even reportedly while making his retirement announcement.
Since discovering a large oil reserve off its coast in 2015, Guyana has been targeted by larger countries hoping to profit from its resources and need for infrastructure to mine said oil.
According to the lawsuit, that was not exactly an original business plan.
A pair of businesses named Curlew Mainstream LLC and Playera Group Global LLC are suing Green, Hebert and Hebert’s law firm, Jones Walker LLP, claiming that the pair used confidential information to compete for a similar contract.
Hebert represented Playera as it worked with Curlew to secure a fuel agreement with the Guyanese government, but allegedly skimmed protected trade information from the company, which was then used to form Prosimos and related entities with Green to compete for a similar contract, according to the lawsuit filed in Florida at the end of February.
In addition to Prosimos being registered to Hebert’s business address and Green overtly competing for business in Guyana, the pair allegedly threatened to leverage their connections to impede Curlew’s pending fuel agreement while Green was still a sitting Congressman and chair of the Committee on Homeland Security.
In April of 2025, the lawsuit alleges, Green and Hebert “alluded to influence over whether Curlew Midstream could secure the Fuel Exchange agreement,” during a meeting in D.C. Later the same week, the pair formed Prosimos in Florida, according to state business records. The lawsuit alleges the pair then communicated with the Guyanese government about “issues” with Curlew, delaying the agreement.
The lawsuit claims that, as recently as January, Curlew was communicating with the Guyanese government about resolving the remaining “issues” that hindered the original fuel agreement, during which time Green traveled, again, to the country to broker a comparable fuel deal.
Then, in mid-January, the government sent a signable agreement to Curlew with “last-minute” changes, including a relationship with an unnamed consultant, according to the lawsuit, which also claims the Guyanese government did not initiate those changes.
The defendants have not filed a response to the lawsuit as of the time of publication.
Neither attorney for the plaintiffs nor Herbert’s office responded to requests for comment from the Banner.
Efforts to contact Green were unsuccessful.
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