Alexander Williamson attended Mohawk College in its inaugural year of 1967 majoring in the Business Administration (Marketing) programme. Alexander graduated in 1969 and thereafter attended Canisius College in Buffalo NY graduating with a Bachelor of Science degree in Business Administration. At that time he also took several credits towards his Master of Business Administration degree.

In 1971, Alexander was hired by Bell Canada as a Marketing Representative where he was promoted, in 1973, to the position of Marketing Manager. He left Bell Canada to pursue a career in law enforcement and joined the Ontario Provincial Police in 1975. During his early years with the OPP he obtained Certificates in General, Advanced and Managerial Police Studies from the University of Western Ontario.

In 1988 Alexander was selected to initiate Crime Stoppers programmes in the OPP jurisdiction and was soon promoted to be the Crime Stoppers Programme Manager for the OPP for Ontario, working out of OPP General Headquarters. He was involved in the establishment of the Ontario Association of Crime Stoppers which oversees the operation of the 38 Ontario Crime Stoppers programmes and served on that Board since its inception in 1992. Alexander has continued to serve as a volunteer Director on the OACS since retirement having just completed a three year term as the President. He was also selected as the Ontario Director for the Canadian Association of Crime Stoppers.

In 1997, while with the OPP, Alexander was hired by the Laboratory for Scientific Interrogation to teach the Scientific Content Analysis (SCAN) course. He taught 83 SCAN interview and interrogation courses from 1997-2007 in the USA, Canada, Great Britain, Australia and Africa to law enforcement, military intelligence and corporate security personnel.

In 2006 Alexander accepted a position as Professor in the Police Foundations programme at Sheridan College where he teaches interviewing and interrogation techniques until he left Sheridan in 2017 and accepted a position at Georgian College in Orillia in their Police Foundations programme where he is teaching Police Powers and Community Policing courses.