Okay, let’s tackle this. So David Leach has an MBA from the Tuck School of Business at Dartmouth, which is a reputable institution. He has skills like investment banking, corporate finance, and private equity, which are in high demand. He also has experience in financial modeling, mergers, valuation, business strategy, and corporate development. Location is Arlington, Virginia, which is a hub for finance and business. Considering his education and skills, I would estimate his hourly rate to be around $250. This is slightly below the average rate for investment bankers with an MBA, but it's still a competitive rate for someone with his experience and skills in the local market.