A California man already convicted of molesting children for three decades in multiple states was sentenced Monday to 150 years in prison for abusing two 12-year-old boys.

Dean Arthur Schwartzmiller, 64, was given the maximum sentence for 11 felony counts of child molestation and one misdemeanour charge of possessing child pornography.

Dean Arthur Schwartzmiller listens to a judge in a San Jose courtroom on Monday as he is sentenced to 150 years to life for sexually abusing two 12-year-old boys.
(Paul Sakuma/ Associated Press)

Schwartzmiller, of San Jose, represented himself during his trial last year but asked for a lawyer for the sentencing phase.

During the nearly three-week trial, lawyer Steve Fein showed jurors a map of the "places and decades where the defendant has molested young boys." It included an estimated 100 accusers dating from 1969 in eight U.S. states, Mexico and Brazil.

When Schwartzmiller was arrested in Washington state in June 2005, investigators found a memoir describing abuse, binders full of child pornography and 1,500 notebook pages with headings including "blond boys," "no, but yes boys," and "best of the best, 13 and under."

Police also found handwritten and computer records listing more than 36,000 children's names, many accompanied by such notations.

With files from the Associated Press