organizer

noun

1. 1. a person who organizes
   2. ☆ a labor-union official whose work is enlisting new members
2. 1. a device, usually with many compartments, for use in arranging items on a desktop, the contents of a closet, etc. more efficiently
   2. planner (sense )
3. Embryology any portion of a developing embryo, or any substance produced by it, capable of inducing differentiation in other portions