Okay, let’s tackle this. So David has 39 years of experience as a Research Engineer at Oak Ridge National Laboratory, which is a high-level position. His education from the University of Tennessee-Knoxville adds prestige. Skills like Chemical Engineering, Strategic Planning, and Research are in demand. Location is South Cambridge, New York, which is a moderate-cost area. Considering his experience and education, maybe around $125–$200 per hour? But given his background, maybe higher. Some engineers with his level of experience might average $150–$250. So I’ll estimate around $125, taking into account the moderate location and his skillset.