[8][9] Zebley graduated from the College of William & Mary[10] magna cum laude and Phi Beta Kappa in 1992.

[11] After working at Orrick, Herrington & Sutcliffe from July to December 1997, he would enter and graduate from the FBI Academy in 1998.

[13] Zebley was on the arrest team that captured one of the embassy bombers, Khalfan Khamis Mohamed, in October 1999 in Cape Town, South Africa.

[14] Zebley was one of the investigators who built the case against Zacarias Moussaoui, who was ultimately sentenced to life imprisonment.

[11][16] While in private practice at WilmerHale, Zebley was an expert in cybersecurity[12] and represented a wide range of clients, including Justin Cooper, a former aide to Hillary Clinton,[17] and the National Football League.