As a sergeant Ferguson was assigned to the Patrol Division working evenings and midnights. During this time, he attended the Law Enforcement Management Institute at Babson College and continued his education, earning his Masters Degree from Western New England College.
In July 1998, he was promoted to the rank of Lieutenant and attended the three week leadership program at UMASS Lowell. He was assigned to the patrol unit, working both the evening and midnight shift.
During this time, he was invited to attend round table discussions, sponsored by the Boston Police Department, which focused on leadership and ethical issues in policing.