Dr. P. Hariharan is born in a Tamil speaking village in India. He is interested in writing articles in regional magazines to propagate siddha system among the public. He is a Professor, Head of the Department and Vice Principal of Santhigiri Siddha Medical College. He has presented 9 papers in various national, regional and international conferences and authored and co-authored one text each in Siddha and translated one text into English. He is also working as a member of the Board of Studies- Siddha, Member of Faculty of Ayurveda and Siddha of Kerala University of Health Sciences. Being a resource person he is continuing the teachings in medical education programs organized regularly by Rashtriya Ayurveda Vidyapeeth (Nodal agency of the Ministry of AYUSH), New Delhi. He is also an evaluator of PhD thesis in Tamil Nadu MGR Medical University, Chennai.