Jim DeBonis, the founder of Ascentia Wine Estates, has been replaced as chief executive officer in the latest shakeup of the troubled Healdsburg wine company. Michael Kenton, former president and CEO of Artesa Winery in Napa, has been named chief executive of Ascentia, the company announced Wednesday. DeBonis had the “vision and guts” to form Ascentia in 2008, but it was time for someone with additional sales and marketing experience to take the helm, company spokesman Sam Singer said. He denied DeBonis was ousted.