The Long Island, N.Y., financial adviser who stole the life savings of dozens of retirees, including a blind retired Manhattan firefighter, told a Nassau County judge Tuesday before his sentencing that his plan while in prison is to “never stop helping [the victims] as best I can.”

Peter J. Dawson, 51, who pleaded guilty last year to charges of stealing more than $11 million from investors, vowed to “do everything in my power to tell the truth,” including testifying against the mortgage lenders and brokers to whom he funneled the stolen funds.