Froebel (1782-1852) was one of the very early theorists concerned with play. He believed that it was vital to child development, and that children enjoyed it. He was also the first person to set out a comprehensive theory of how children learn and how others could apply his work. His work is still popular because it allows children to be children, and not progress onto the next stage of development too quickly. He was very interested in the mother-child attachment and pioneered women teachers as well as free play, sensory experiences and plenty of time outdoors.