Gene DeSantis has made it his mission to plant trees all over Baltimore, he's up to ~13,849 so far.
Despite the fact that most folks in town might not know Gene DeSantis by name, the fruits of his labor are nearly everywhere. As a community volunteer working with Baltimore's Parks & People Foundation, DeSantis says he's personally planted an amazing 13,849 saplings in public parks and sidewalk planters throughout the city.
Gene has planted trees in just about every neighborhood in Baltimore. He's brought them to parks big and small, sat them along streets, dug spaces for them in tight corners, inserted them next to tall buildings and plunked them down by gurgling streams. He never accepts any sort of payment. Says he doesn't need to. Satisfaction comes from watching them grow and knowing that he's fulfilling a personal commitment he made many years ago.
Source -> http://www.treehugger.com/files/2011/10/modern-day-johnny-appleseed-has-planted-13849-trees.php