Leff will directly report to Xavier Williams, president of AT&T’s public sector and wholesale solutions business, the company said Thursday.
The two-decade industry veteran has managed teams to develop communications platforms and other technology systems for civilian and defense agencies.
He also worked at Lockheed Martin (NYSE: LMT) as director of the defense contractor’s civilian enterprise solutions business and chief technology officer for health and human services business line.
Chris Smith, formerly VP of technology for AT&T’s public sector business, has been appointed VP of strategy, operations and technology.
Smith will also report to Williams and focus on efforts to help build up the company’s end-to-end service offerings for clients.
The 20-year federal technology veteran joined AT&T in 2013 after he served as U.S. federal chief technology and innovation officer at Accenture.
Prior to Accenture, he served at the Agriculture Department as chief information officer and held senior leadership roles at the General Services Administration and Internal Revenue Service.