Let's try an experiment: --- Hi, I'm new to this board. I have a question about motivation. I'm running a mobile start-up and we just moved into our new offic

Let's try an experiment: --- Hi, I'm new to this board. I have a question about motivation. I'm running a mobile start-up and we just moved into our new offices. We started working on our spare time putting in time whenever it was available. Now, my co-founder and I are dedicated full time to the business and we've hired a couple of interns. The problem however is that while I consistently develop our product, my co-founder (the business guy, I'm the engineer) shows up every morning at 9 AM sharp, and demands I do the same. We've had several discussions about "inappropriate" this is and how I'm "degrading office morale" (mine and the intern's) by showing up "so late" every day. We're supposed to be partners, but he continues to demand that I show up at 9 AM like he does, every day, with no regard for my opinion or how well I'm building our product. ... What I really want is a decent fucking co-founde who understands that products aren't build only between 9AM and 5PM, and who can be professional and courteous during his conversations with me. Does any one have an idea on how to motivate him to do this?