Marvin Johnson & Associates | 349 followers on LinkedIn. The people of Marvin Johnson & Associates (MJAI) are specialists in a specialized world, concentrating on the highly specific and ever-changing demands of the trucking industry. Founder Marvin Johnson spent a career writing life, auto and truck insurance policies, and a decade of concentrating exclusively on truck insurance before opening Marvin Johnson & Associates in 1971. During those ten years (operating from a friend’s truck terminal), Marvin Johnson researched the trucking industry and learned everything he could from it’s drivers.