A lawyer has pleaded guilty to not paying taxes on nearly $11 million in income while working at a major Wall Street law firm.

John O’Brien entered the plea Thursday in federal court in Manhattan.

The government had accused the 48-year-old O’Brien of failing to pay $2.5 million taxes on $10.8 million in income from 2001 to 2008. They say during that time, he splurged on a weekend home, international travel and a rare book business.

Prosecutors say O’Brien has agreed to pay $2.8 million in back taxes and interest. At his Nov. 16 sentencing, he faces a maximum of four years in prison, though the term will probably be shorter under sentencing guidelines.