John Kotsias, the author of Essential Movements of T'ai Chi, is a linguist and professor of mathematics with many of years experience in the practice of T'ai Chi.

Herb Rich [1], the illustrator, is also an expert T'ai Chi practitioner who has represented the US at the World T'ai Chi Federation gathering in China.

The sum of their work is a text that has long been essential stock for many bookstores. Practical, effectively illustrated and rich with guided instruction, Essential Movements of T'ai Chi is popular because it helps people learn.