Foster Group Inc., a fee-only investment advisory firm based in West Des Moines, announced that its founder and CEO, Jerry Foster, has assumed a new role as chairman and that its longtime president, Mark Stadtlander, has been named CEO. The changes are part of Foster Group’s growth and leadership continuity strategy, the firm said in a release. As part of the changes, three shareholders have been named to new leadership positions.Travis Rychnovsky has been named chief operating officer; Buck Olson is chief marketing officer and Kent Kramer is chief investment officer.