A man was sentenced to 16 years in prison Tuesday for sexual assault and disorderly conduct he committed in downtown Madison and University of Wisconsin campus area in 2010.

Robert Rickaby, 27, was found guilty in August 2011 of two counts of 2nd degree sexual assault, one count of 4th degree sexual assault and one count of disorderly conduct, according to Dane County Circuit Court documents. These sexual assaults were committed within an 11-hour period.

Rickaby was sentenced to 10 years probation and to maintain compliance with the Sex Offender Registration Program, according to court documents. He could not have direct or indirect contact with the victims.

He was sentenced to probation because he was recently diagnosed with autism spectrum disorder, or Asperger syndrome, according to the Wisconsin State Journal.

After Rickaby’s probation was revoked he was sentenced to 16 years in prison and eight years of extended supervision, court documents said. Circuit Judge Rhonda Lanford cited concerns for public safety if Rickaby was not sentenced, according to the Wisconsin State Journal.

His probation was revoked because he refused to fully participate in sex offender mental health treatment, according to the Wisconsin State Journal.