Okay, let’s tackle this. So Bill Brown has 57 years of experience as an interior designer, which is incredibly long. This level of experience typically commands a higher rate. In the US, interior designers with 20+ years of experience can charge $75-$200 per hour, depending on the location and industry demand. Since Bill is based in Dublin, GA, a smaller market, his rate might be lower than that of his peers in larger cities. However, his extensive experience and specialization in green building and custom furniture design suggest he could charge a premium. Considering these factors, I estimate his hourly rate to be around $150.