Mr Scullin was appointed as the founding chairman of BTIM prior to the company listing on the Australian Securities Exchange in 2007.
He will retire as chairman following the conclusion of BTIM’s annual general meeting on 6 December.
Mr Scullin said BTIM had emerged from the global financial crisis as a “stronger and increasingly diversified investment management company”.
“I feel this is an opportune time to retire knowing that I leave the company in the trusted and capable hands of James Evans as incoming chairman, and with a clear strategic focus from Emilio Gonzalez as chief executive officer,” said Mr Scullin.
Mr Evans said Mr Scullin had provided strong leadership as BTIM went through a “transformational transaction with the acquisition of J O Hambro Capital Management”.
“I am confident that going forward BTIM has the right strategy and management team in place to continue to grow, and I look forward to taking over as chairman in December,” said Mr Evans.
Mr Evans currently holds senior roles within the Commonwealth Bank and Lend Lease, along with non-executive directorships of the Equigroup companies, Hastings Funds Management, Investa Wholesale Funds Management, Macquarie Generation and Suncorp Portfolio Services.