Okay, let’s calculate this. Mark has a Master’s degree from Northwestern University’s Kellogg School of Management, which is a reputable institution. His skills include management consulting, strategy, leadership, and HR consulting, which are in demand. However, his rate is lower than what I would expect for someone with a Kellogg degree, possibly due to being in Tucson, Arizona. Consulting rates can vary widely depending on location, experience, and industry. Considering his skills and education, I would expect him to charge higher rates, possibly in the range of $200-$300 per hour. But given the location, I’ll estimate around $125 per hour, which is lower than average but still competitive for Tucson.