 A total of 295 employees and 63 consultants died in the attack, including 1 who was aboard the hijacked aircraft.Mercer Management Consulting was restructured in the aftermath of the incident, and their Washington D.C and Geneva offices were shuttered.By 2003, Mercer Management Consulting was ranked as the 6th best consulting firm while Oliver, Wyman & Company was the 9th, according to Vault.