A cell biologist or molecular biologist focused on studying mitochondrial function and disease, likely working in an academic research setting or biotechnology industry.
Just saw a fascinating display on cellular energy production—it really highlights the critical role of mitochondria in overall health, something we should all be more aware of, especially given their involvement in so many diseases.  Understanding mitochondrial function is absolutely key to developing more effective therapies, and frankly, we need more investment in this area.