Who is the monk?

Above is a group photo taken way back in early 60s, after I rendered 2 or 3 krithis in All India Sai Samaj (Saibaba Temple, Mylapore). In the audience were a revered monk (at whose feet I am seated) and somebody called "Professor Rege" (I still remember his name). The eyes of His Holiness are deep with knowledge of the Self. I was too young to know any details about Him. I wish to know particulars about His Holiness.
(Click on photo to enlarge).