A Manhattan jury convicted Raphael Golb Thursday of 30 of 31 counts against him. Golb was acquitted on one charge of criminal impersonation.
Prosecutors say the 50-year-old Golb disguised his identity in e-mail messages and blog posts to harass and discredit his professor father's detractors in a dispute over the origins of the scrolls.
The more than 2,000-year-old documents contain the earliest known versions of portions of the Hebrew Bible.
Golb didn't acknowledge writing the e-mails or posts but said they amounted to academic whistle-blowing, not crime.