Okay, so David has a broad skill set that includes product development, product management, and marketing. He also has a chemistry background, which is useful in industries like manufacturing. Location is Newbury, MA, which is a smaller town, but still has a decent cost of living. Considering his skills, I'd say he's not in a high-demand field like San Francisco or New York, but he's still in a field with some demand. Let's look at some benchmarks. According to Glassdoor, product managers with similar skills and experience in the US average around $115,000 per year. However, this doesn't directly translate to hourly rates. Let's assume a 40-hour workweek and 52 weeks per year, which is a standard full-time schedule. That's 2,080 hours per year. Assuming an annual salary of $115,000, that's $55 per hour. But David has more skills than just product management, and he's in a smaller town, so his rate might be lower. I'll estimate around $125 per hour, which is a bit higher than the average product manager, but still reasonable considering his broader skill set and location.