Tarek Mehanna, 29, of Sudbury, was found guilty on four terrorism-related charges and three charges related to providing false information to the government.
It took a U.S. District Court jury 10 hours to convict Mehanna following a nearly eight-week trial.
U.S. Attorney Carmen Ortiz said in a release the jury "rendered a just verdict of guilty."
"From his travel to Yemen to receive training to kill American soldiers to his material support for terrorism at home, Mr. Mehanna's efforts to use and support violence followed no predefined path and knew no bounds," said Richard DesLauriers, the special agent in charge of the Boston FBI. "The FBI fulfilled its most important mission by stopping Mehanna's conspiracy to support terrorism, the goal of which was an unlawful affront to our nation's cherished ideal of peaceful dissent."
Authorities said Mehanna traveled to the Middle East in February 2004, seeking military-type training at a camp where terrorists were prepared for armed jihad against U.S. interests. Once back in the United States, Mehanna provided material support by, among other things, translating and posting on the Internet al-Qaida recruitment videos and other documents, prosecutors said.