Andrew has spent more than four years at the Association and will leave in October. AIFA has begun the process to appoint a replacement.
Stephen Gay, director general of AIFA, said: "After nearly five years at the Association, Andrew has decided to leave to pursue other business opportunities. On behalf of all our members, Council and Boards, I would like to take this opportunity to thank him for his valuable contribution to our work and the development of the intermediary profession.
"His work on detailed regulatory issues from the RDR to the role of European regulation demonstrates the depth of his knowledge of the industry. He has played an extremely important part in delivering a better outcome for members and we wish him well in the future."
Andrew Strange added: "I am proud of the work that AIFA, AMI and AFB do for their members. Policy complexity has expanded exponentially over the past five years, and it has been an exciting time to be involved with the development of European and domestic regulation and government affairs.
"AIFA, AMI and AFB would not be successful without the support of our Council and Boards, and the dedication of all the staff at the organisation, who I would like to thank for their hard work. I am particularly proud to have led an excellent policy team.
"While I will miss participating in the breadth and intellectual rigour of the AIFA group of trade bodies, I look forward to continuing my career in financial services."