Paper Penny Pincher
In case you can't tell, not buying new things was pretty high on J.P.'s priority list. He spent an extraordinary amount of time and energy re-using even the most mundane things, like envelopes, rubber bands and other office supplies.
When someone would send him a letter or a note, instead of writing back to them on a new sheet of paper, he would respond in the margins or on the back sides of the original.