Known for his bold style, Gary Gensler led an ambitious agenda to increase transparency, reduce systemic risk and eliminate conflicts of interest on Wall Street.

U.S. Securities and Exchange Commission Chairman Gary Gensler will resign on Jan. 20 when the administration of newly-elected U.S. President Donald Trump takes over, the agency said, ending an ambitious tenure that saw Gensler clash with Wall Street and the crypto industry.

“I thank President Biden for entrusting me with this incredible responsibility. The SEC fulfilled our mission and enforced the law without fear or favor,” Gensler, who was nominated in 2021 by Democratic President Joe Biden, said in a statement Thursday.

Known for his bold style, Gensler led an ambitious agenda to increase transparency, reduce systemic risk and root out conflicts of interest on Wall Street, implementing dozens of new rules, some of which have been challenged in court.

His key accomplishments included changes to increase the resilience and efficiency of U.S. markets, including accelerating trade deals and overhauling the $28 trillion U.S. Treasury market, as well as a set of rules that will limit investor disclosure and boosted corporate governance.

The Baltimore native also successfully implemented rules imposed by Congress that impose SEC oversight on auditors of U.S.-listed Chinese companies, ending a decade-long battle with Beijing that lawmakers say has left American investors had endangered.

On the enforcement front, Gensler’s SEC has pioneered a multi-year effort targeting Wall Street’s use of text messaging, WhatsApp and other unauthorized channels to discuss cases, levying more than $2 billion in fines against dozens companies including JPMorgan and Goldman Sachs. .

He also took on the cryptocurrency industry, suing Coinbase, Kraken, Binance and others, claiming their failure to register with the agency violated SEC rules, allegations the companies deny and for the challenge in court.

When it comes to crypto, the courts have largely supported Gensler’s positions. Trump is in favor of crypto and had said during the campaign that he would fire Gensler as chairman of the SEC. Since Trump’s victory in the presidential election, Bitcoin has risen 40 percent, reaching the $98,000 mark for the first time on Thursday.

Gensler’s far-reaching agenda and uncompromising attitude led to intense opposition from Wall Street, but also from Republicans in Congress, and even from some Democrats.

The U.S. Chamber of Commerce, the Managed Funds Association and other groups have filed a lawsuit in the conservative-leaning Fifth U.S. Circuit Court of Appeals and elsewhere seeking to overturn at least eight rules, arguing that they are unwarranted, harmful or beyond the authority of the SEC.