He said that while he focused on North America, he spoke with his colleagues handling Europeans. UBS managed even more assets from Switzerland for French clients than for Americans, Birkenfeld said.

While he said in the Feb. 28 interview that he doesn’t deny he was “part of it,” Birkenfeld said he wants to use his knowledge of Geneva’s private banking “little boys’ club” to foster public awareness and fight financial misdeeds.

Birkenfeld pleaded guilty to conspiracy for his role in the U.S. case and was sentenced to 40 months in prison. After his release, he received a $104 million whistle-blower award from the Internal Revenue Service.

Since UBS handed over account names to the U.S., at least 50,000 U.S. taxpayers have avoided prosecution by disclosing offshore accounts to the IRS, generating more than $7 billion in taxes, interest and penalties.

Birkenfeld said he’s ready to help other authorities as he is with the French, “free of charge.” He is already cooperating with two that he declined to identify.

Birkenfeld turned 50 the day before meeting the judges. He now lives in New Hampshire, and it was his first trip to Europe since 2008.

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