Based on the provided skills and location, I estimated Louis's hourly rate to be around $75. This rate is lower than average for a project manager in the Boston area, considering the skills listed. However, it's also lower than the average rate for a Ph.D. holder in the United States. The rate is influenced by the fact that Louis's skills are not typically in high demand, and he may be competing with other professionals for projects. A more accurate rate would require additional information about his experience, industry, and specific job requirements.