Marie Viljoen is a writer and photographer with a background in garden design. She formed the Prospect Park Litter Mob in May 2011. One day she would like to retire from it.

She blogs for pleasure at 66 Square Feet, and she wrote a book about seasonal New York and its food: 66 Square Feet - A Delicious Life (Stewart, Tabori and Chang).

From time to time other volunteers and blog readers write guest posts. Look for the author's name at the bottom of each post, or in the header.