I have had trouble with this as well. I have quite a few side projects. "CEO", "Founder", "President", "Owner", "Managing Director", "Director of Operations", etc all sound a bit too pretentious for the caliber of projects I tend to build on the side. I've put "Head of Customer Support", and "Head of Customer Success" in the past. Does anyone have any other recommendations? Something that doesn't make it look like I'm Will Ferrell and John C Reilly pushing "Prestige Worldwide".