Massachusetts U.S. Attorney Carmen Ortiz announced that William Weinreb, lead prosecutor in the Boston Marathon bomber case, has been appointed as her first assistant U.S. attorney.

Weinreb led a team of prosecutors and investigators in achieving the conviction of Boston Marathon bomber Dzhokhar Tsarnaev last year. The jury susequently recommended that Tsarnaev be sentenced to death by lethan injection.

Weinreb previously served as counsel to the U.S. Attorney for two years and was deputy chief of the National Security Unit as well as coordinator of the Anti-Terrorism Advisory Council, according to a statement from the U.S. attorney's office.

He's had many firsts in his career as well, Ortiz noted in her statement.

"[Weinreb] successfully prosecuted Massachusetts’ first case of foreign economic espionage; its first case involving use of a laser to interfere with the operation of an aircraft; and its first case involving the threatened use of a biological weapon (ricin)," her office said.