Peter R. Feldman, PhD (Medicine)
Founder and Director, Feldman Hair Institute
Hair researcher, Certified Trichologist, and Evidence-Based Hair Fellow focused on independent hair-loss assessment, treatment-response interpretation, and longitudinal monitoring.
Clinical and research focus
Translating measurable scalp biology into clinical intelligence.
His clinical work connects the history, visible distribution, scalp findings, trichoscopy, measurement, existing investigations, treatment exposure, and change over time.
His research examines hair-follicle stem-cell activation, quiescence and reactivation; dormant follicular-unit reactivation; hair-follicle immune regulation and regeneration; inhibitory effects of biotin on hair-follicle stem-cell activation; follicular-unit behaviour; hair-shaft thickening; growth-phase durability; and long-term treatment response.
Training and professional background
- PhD (Medicine), Norwich Medical School, University of East Anglia, United Kingdom.
- Doctoral research supervised by Professor Andrew Messenger.
- Evidence-Based Hair Fellowship under Dr. Jeff Donovan in Canada.
- Mentorship in hair-disorder measurement with Dr. Dominique Van Neste in Belgium.
- Early trichology clinical training under David Salinger in Australia.
- Certified Trichologist.
- Member of the American Hair Research Society.
- Hair-loss, measurement, and regrowth research presented at international hair research conferences.
- Peer reviewer for dermatology journal manuscripts.
- International master classes for trichologists.
Research themes
- Hair-follicle stem-cell activation, quiescence and reactivation, including inhibitory effects of biotin.
- Dormant follicular-unit reactivation and changes in follicular-unit output.
- Hair-follicle immune regulation and regenerative biology.
- Hair-shaft thickening, growth-phase durability, and long-term response.
- Inflammatory and scarring-pattern interpretation, treatment-response measurement, and longitudinal comparison.
- Measurement standardization and multi-driver analysis of hair loss, recovery, and regrowth.
Evidence that sharpens the assessment
FHI applies evidence from hair biology, clinical trichology, measurement science, longitudinal observation, and treatment-response research to the individual case.
- The scalp is assessed across its distribution rather than reduced to one isolated finding.
- Change over time is treated as evidence.
- Treatment response is interpreted against timing, exposure, expected biology, and competing influences.
- Photographs, scalp findings, symptoms, existing laboratory information, biopsy reports, diagnoses, and response are interpreted together.
- Multiple processes can be considered when the presentation does not fit a single explanation.