Okay, let’s tackle this. So Marcus has a broad range of skills, including renewable energy, biofuels, and sustainability. He’s also got experience in R&D, project management, and product development, which are all in demand. However, his specific expertise in these areas might not command the highest rates. Location is Greater Boston, which is a hub for start-ups and tech companies. However, based on national averages and salary benchmarks, I’d estimate his rate to be around $125 per hour. This is slightly below the national average for a sustainability expert, but it’s still a competitive rate for someone with his skill set and experience in the Boston area.