Col.S.D.Maini is the co-founder of S M Creative Electronics Ltd in 1992, along with Sanjay Trehan.
He was commissioned in the Corps of Electrical and Mechanical Engineers (EME), Indian Army in 1950. Later, he joined Bharat Electronics Limited (BEL), the premier defense electronics company in India and he was instrumental in setting up Ghaziabad, Panchkula, and Kotdwar Plants of BEL and retired from BEL in 1985 as Executive Director (Northern Units).
He actively takes part in product design, development & engineering activities and quality assurance.