Mueller founded the Makenna Foundation, which in nine years has raised more than $1.2 million and is the largest fundraiser for the Kentucky Children’s Hospital. Funds have provided state-of-the-art medical equipment and much-needed renovations. In July 2010, the foundation celebrated the grand opening of the Makenna David Pediatric Emergency Center, with a child-friendly waiting room and 15 state-of-the-art exam rooms.