Royal London's longstanding pensions spokesperson Fiona Tait will leave the firm at the end of March to become Intelligent Pensions' technical director.
She will replace pensions veteran David Trenner, who is retiring from his role after 16 years at the firm.
Ms Tait has been Royal London's business development manager since 2004.
She will begin her Glasgow-based role at Intelligent Pensions at the end of April.
Ms Tait told FTAdviser she had "always been interested in joining the advice sector rather than working for a provider".
She said: "After 12 years at Royal London, I felt it was now or never."
Her departure comes shortly after former pensions minister Steve Webb joined Royal London.
Prior to Mr Webb's arrival, Ms Tait was the firm's chief pensions spokesperson.
When asked whether this influenced her decision to leave, she said: "Anyone that's lucky enough to have Steve Webb probably doesn't need anyone else.
"It means I don't have to feel bad about abandoning them.
"Royal London is a fabulous company to work for, and the ethos they have is probably the reason I couldn't go to work for another product provider."
Mr Trenner said: "I have thoroughly enjoyed my career in pensions and in particular with Intelligent Pensions.
"Over the past 40 years, there have been very few dull days and I have continued to learn and meet some fascinating people. I now look forward to spending more time with my wife and family and keeping up with my cricket and football interests.”
Steve Patterson, managing director of Intelligent Pensions said: "David has made a positive contribution at Intelligent Pensions and we have all enjoyed working with him. We wish him the very best for his retirement and are pleased that he is now able to benefit from his own retirement advice.
“Fiona is a great addition to the company and to our senior management team. She has worked tirelessly to raise the technical standards in the pensions industry and is outspoken in her views on how changes and improvements can be made to encourage long term savings and ensure better consumer outcomes.
"Her technical knowledge is second to none and as we continue to develop the business she will be a driving force behind this.”
In a statement today (9 March), a Royal London spokesperson said: "We are sad to see Fiona go but this is a great opportunity for her to work in the advice sector, which Fiona is very passionate about.
"Fiona has made an enormous contribution to the success of Royal London’s Intermediary Pensions business and Royal London Group, and we wish her the very best in her new chosen career."
Mr Trenner said he had known Ms Tait for many years, and described her as "fantastic".
Additional reporting by Julia Faurschou