To most Arsenal fans, the name Mathieu Flamini evokes memories of a tough-tackling, technically gifted French midfielder who gave them one of the most memorable night's in their recent history.
Flamini of course was the man who scored the most remarkable of braces away at fierce rivals Tottenham Hotspur in the League Cup back in September of 2015.
However, the Frenchman has since swapped shin-pads and boots for business attire and has barely looked back since.
Calling time on his playing career in 2019, but was already putting in the groundwork for a lucrative and rewarding career long before his retirement from football.
Does Flamini lead the most interesting post-football career of any Premier League star? HAVE YOUR SAY BELOW!
A co-founder and partner of GF Biochemicals from 2008 onwards, Flamini has pocketed millions as a result of his presence in the company that became the first worldwide to be able to produce oil-substitute Levulinic Acid at a mass scale.
According to Forbes, Flamini is now estimated to be worth around £10.2billion.
Having started the company alongside business partner Pasquale Granata, the business now employs over 400 workers, with 80 based at their plant in Caserta, Italy, operating in a market worth around £20billion.
Some may claim that surely starting a huge environmentally-friendly company while playing top-flight football could be a case of biting off more than they can chew, but not in Flamini's case.
"When you start something like that and you spend so much money, and where there is risk there is stress," he explained.
"To me, it was an escape. A football career is made of ups and downs. It cleared my mind and helped me to think about something different.
"And it was something intellectually challenging too."
Flamini's passion for a more eco-friendly planet has been something that he has harboured since he was very young.
"Growing up by the sea, I could see from a very early age the impact of plastics in the water, on the beach," he told the Guardian.
"It’s horrendous and makes you realise that, if we don’t change something, the place where we live won’t be liveable any more.
"I was very aware of everything, very curious. I always told myself: ‘If I do something else later on outside football, I want it to be around sustainability.'"
GF Biochemicals achieved astonishing success, with levulinic acid now recognised by the U.S. Department of Energy as one of just 12 molecules that can help unlock a "greener" world.
But that is now Flamini's only source of income.
In fact, he has gone into business with yet another former Arsenal star in Mesut Ozil as the pair team up to launch Unity and The Unity Performance academy.
The company's goal is to produce "supplements that work and advice you can trust" from elite athletes, coaches, sports doctors and academics.
Speaking to Forbes about the venture, Flamini said: "What we want to do on this platform is provide trusted, transparent and reliable information and experience coming directly from the athletes themselves.
"But it’s also a platform where we can engage with experts in nutrition, in fitness, in mental strength, sharing their knowledge and sharing their experience.
"Athletes have a platform, they have a following. And I strongly believe an athlete has a social responsibility to take some kind of lead around providing information or trying to guide people how to live a better lifestyle."
Yet again the company's roots are intertwined with being green as a priority, as Ozil explained.
"It all started with our friendship. Mathieu always talked about business opportunities, about the planet, about the climate, and I was more the guy on the social side," he told GQ.
"I went to Jordan and there I got to experience kids that have nothing. I had a difficult childhood myself, but this was something that changed my life.
"I realised after that these were war refugees, but after talking more to Mathieu we also realised that these were refugees from climate change and that people have no fresh water or food.
"We said, ‘What we can do together? We're on different sides, but we hope we can start something.’ This is the beginning of a long journey and we hope we can help others in the process."
All the while, Flamini is desperately trying to use the power of sport as a means to spread the message about climate change.
He told UEFA : "Football is a sport that is played outdoors. I think is important is to remind people that, in some countries, you can't even exercise outdoors anymore. because of the impact of pollution.
"You can't even see the sun. Obviously, we have to protect the sport we love so much. We also have to make sure that, one day, playing football outdoors does not become a luxury.
"My message to all football players out there: don't be scared of speaking anymore, don't be scared of using your voice, don't be scared of standing up for your beliefs and what you want to change.
"I think the next generational athlete will be the one who empowers people to stand up for their beliefs."
