Okay, let’s tackle this. So Mary J. Sparks has 31 years of experience in research and education, which is impressive. Her role as a Research Supervisor at the University of Maryland School of Medicine suggests a high level of expertise. Skills like data analysis, clinical research, and genetics are also in demand. Location is Baltimore, MD, which is a hub for biotech and healthcare. Given her experience and skills, I would estimate her hourly rate to be around $150, which is slightly below the national average for researchers with similar experience. However, considering her role as a supervisor and educator, I would not be surprised if she charges more, potentially upwards of $200-$250 per hour.