He has a BA in Marketing/Economics, 1981. After college, Cardone joined startup, Natural Gas Clearinghouse in 1987 as the 12th employee,  and would help it become Fortune 30 Dynegy after joining the company in 1987 after doing mergers with Morgan Stanley, BG plc and Chevron and then going public.Cardone moved to London in 1992.  

He was the architect of the UK’s National Balancing Point, known today as one of the most reliable energy trading hubs in the world.   Gary would build two large businesses between 92 and 02 for Dynegy and would become known as one of the most successful trading companys in Europe controlling all the storage in the UK, employing over 600 staff, and  doing 4 billion in revenue per year.Cardone sold all his stock on one afternoon in 2001, and retired from Energy in 2002, predicting a decade long unwinding of energy trading firms from the impact of mark-to-market abuses by Enron and others. 

He returned to the USA, moving to Los Angeles,  California.In 2008 he became strategic commercial adviser to Arclight Capital, a prestigious PE firm focused on energy infrastructure in the USA and Europe.In 2012, Cardone assisted friend /  founder of AP&G an energy wholesaler into structuring a transaction with EDF (largest power company in the world) using a unique construct designed to vertically integrate the firm.  This move would help build a company that yields 72 million per year of net income for over a decade.

At the same time he became seed investor of Cardone Capital (twin brother Grant Cardone’s large mulit-dwelling investment vehicle).   Cardone Capital is one of the largest independent holders of multi-dwelling real estate in the USA, where he continues to hold a position.2012, Cardone founded Global E-Trading, and funded Chargebacks911, a fraud technology company designed to FIX the 1/2 trillion dollar per year disputes issue plaguing the credit card industry.  CB911 would help build an entire industry focused on chargeback disputes,  and became ‘the gold standard’ of all dispute firms, providing its technology to some of the largest banks, and merchants in the world.

In 2022 Cardone formed Card1Ventures, to invest in Blockchain technology, and digital assets (currencies).   Months after forming Card1, becomes the lead investor in  Node40, Inc, a Delaware firm, focused on accounting, tracing, and tracking of digital assets around the world.  Node40 deals with some of the largest accounting, tax firms, regulatory bodies and financial institutions in the world.

Cardone lives on an island outside of St . Petersburg’s / Tampa area, has two daughters, and travels prolifically helping entrepreneurs, founders and businesses scale in a profitable and sustainable manner. He is an avid skier, fisherman, and gambler, with a great interest in history and religion.