After completing LLB, Dinakar had thought of legal practice. This thought did not last long. An advertisement from the Servants of India Society inviting applications for life membership changed the course of his life. He decided to devote life for social service and applied for the membership. He was selected and joined as member at Mumbai office of Servants of India Society in 1935. He shaped his career under the guidance of eminent socialist leader Sri S M Joshi; with dedication to service he served as life member and Head of the Mumbai Office of the Society.