Prior to joining GTRI, Gerber was the associate head of the Air and Missile Defense Technology Division at MIT Lincoln Laboratory.

[3] He returned to Lincoln Laboratory in 1996 as assistant leader of the Air Defense Techniques Group.

In 1997, Gerber began working with the Navy's Program Executive Office for Theater Surface Combatants as an intergovernmental Personnel Act appointee, where he helped stand up a new organization and initiated the development of a next generation of radars for the Surface Navy.

[3] He became the associate head of the Air and Missile Defense Technology Division in 2004,[3] a position he held until he was selected to become the director of GTRI in 2015.

[4][5] Gerber left GTRI in 2018 to become Vice President for Innovation and Strategic Pursuits at Raytheon Integrated Defense Systems,[6] and became Vice President for Capabilities Analysis and Assessment at Raytheon Missiles and Defense in 2019.