Okay, let’s calculate this. So Brian is a physical therapist with a Doctor of Physical Therapy degree from the University of Pittsburgh. Physical therapists in the US, especially in Philadelphia, can charge varying rates based on experience and industry demand. According to the Bureau of Labor Statistics, the median annual salary for physical therapists in the US is around $89,000. However, this doesn’t directly translate to an hourly rate. Assuming a standard 40-hour workweek and 52 weeks per year, the median annual salary would be around $44 per hour. Considering Brian's expertise in rehabilitation sciences, he might charge a premium. However, without specific experience or industry benchmarks, I'll estimate a conservative rate of $75 per hour.