S.L.Sah passed Grad. I.E.R.E. from London in 1972. He worked in Ionospheric Research Scheme of All India Radio. He worked also with the Central elctronic Engineering Research Institute, Pilani; civil Aviation Department, Bombay and Physical Research Laboratory, Ahmedabad. He also worked with the Oil and Natural Gas Commission to supervise the design, development, operation and repair of geophysical and communication instruments and other electonic instruments. the many accomplishmnts in his long career include design and development of audio-acoustic cir4cuits; operation, repair and maintenance of ILS, VOR, AD-200 and other navigational aids and development of "payloads" for rockets to monitor the lower atmosphere. He has visited IFP, france to evaluate the use of seismic sources for onshore and offshore exploration. he retired as Chief Engineer (E&T) from ONGC in 1990. He has pubolished more than 110 papers and two books.He is an Associate Member of the Instution of Engineers (India), Member of the Institution of Electrical Engineers (L: ondon) and Fellow of the Institution of Instrumentation Scientists and Technologists (India).