Keith's note: This is what Alan Stern, the Principal investigator for the NASA New Horizons mission does with the Twitter account @NewHorizons2015 that served as the the official - and then the quasi-official mission's Twitter presence. He wants you to know that he just bought an expensive Tesla. Clearly the job pays well. Check out the most recent IRS 990 form for SwRI. Scroll past Part XII for "additional data" and you'll see that senior SwRI staff (including Stern) are exceptionally well paid - vastly in excess of what anyone at NASA is paid. Of course, with regard to work on New Horizons, the funding comes from NASA.