Steven Wexler was a former Starfleet officer later assigned as a senior security agent to Federation President Nanietta Bacco.

During the invasion of the Borg Collective in 2381, Wexler escorted the President and some of her senior cabinet members around the Palais de la Concorde. (ST - Destiny novel: Gods of Night)

Later, President Bacco attempted to rally a fleet of local star powers to fight the invading Borg Collective, and held a summit with numerous ambassadors. Wexler escorted Safranski in to see President Bacco before locking the doors behind them. Later, Wexler and several other protection agents were present as security when Tholian Ambassador Tezrene confronted Bacco, and flanked the enraged political figure when she stormed out. (ST - Destiny novel: Mere Mortals)

Wexler typically saw visitors to President Bacco into and out of her office, including Esperanza Piñiero to report news of the destruction of Deneva and Fleet Admiral Leonard James Akaar for a midnight briefing. When the Borg reached the Sol system, Bacco and select members of her cabinet gathered in the Monet Room where they expected to witness their destruction, protected by Kistler and Wexler. However, thanks to a plan enacted by several Starfleet vessels - the USS Enterprise-E, USS Aventine, and USS Titan - and a race known as the Caeliar, the invasion was halted and the Borg Collective destroyed forever. Due to this, former Borg drone Seven of Nine collapsed in the Monet Room; President Bacco attempted to render aid, but Wexler originally attempted to stop her from getting close. In the aftermath, President Bacco addressed the Federation with Kant Jorel and Esperanza Piñiero by her side; Wexler and Kistler escorted them to the stage, and then off and back to the President's office. (ST - Destiny novel: Lost Souls)