Chief Revenue Officer Mike Goss will replace Wetzel at the end of next week.
Nathanson, Focus' president and CEO of The Colony Group, takes over for interim CEO Dan Glaser.
With careful planning, an owner buyout can benefit all parties.
Dusty Sternadel pleaded guilty to wire fraud in January in connection with a scheme that stole from at least 10 clients, most of whom were elderly, according to the DOJ.