Culvers mourns death of CEO, speaker at MLC summer conference

Keiser died on Saturday of natural causes, the firm said. With his death, co-founder Craig Culver will take over as interim CEO until a successor is named.  Keiser would have turned 61 on Monday. Keiser worked for Culver's for more than 20 years and was a driving force in the chain's expansion, the company said. Since 1996, Culver's has grown from 44 restaurants to 580 spread across 24 states.  Almost all of the restaurants — known for its "Butter Burgers" and frozen custard — are franchises.