Samuel Leeds Allen (May 5, 1841 – March 28, 1918) was the founder of S.L. Allen & Company in Philadelphia. He was the inventor of, and his company manufactured, both the Flexible Flyer sled and Planet Jr farm and garden equipment. For over one hundred years these products were the best selling and most famous market gardening tools and American sleds.[1] During his lifetime and for the first half of the 20th century S.L. Allen was far more renowned for his company's seed drills and cultivating equipment than the sleds.