The high-level answer is Google an influencer marketing agency. Good agencies allow you to search their influencer database by business category or keyword so you can find the most influential person that pertains to your business.  Don't think that influencer marketing is just for food, fashion, and travel. I have worked on many influencer marketing campaigns for music, entertainment, hobbies, television, and even construction management. It has been done!  At its core, influencer marketing is finding the right, influential and engaging person to tell an AUTHENTIC and PERSONALIZED story. STORYTELLERS make the most impact in today's marketing world.