Chessel was at Skandia for 15 years. Chief development officer Peter Mann will assume his role.
The insurer says the review is likely to see support for advisers increase but it could not rule out whether wider redundancies were on the cards.
The firm currently has around 100 business consultants.
A spokesman says: “We are reviewing what we currently do and it is likely we will build on the business consultants we have in the field by delivering alternative ways for advisers to work with us. What we will not be doing is getting rid of our regional support.
“At this stage it is unknown whether there will be wider redundancies as part of this review. Dave is an isolated case at the moment. When the review is completed we will clearly announce any changes.
“Although one person is leaving the actual review is about Skandia expanding the support it provides to advisers. We are IFA only and are well known for the support we provide advisers and we are not going to do anything to jeopardise that service.”