General overview of Montessori Method on Wikipedia:

The Association Montessori Internationale was founded in 1929 by Dr. Maria Montessori to maintain the integrity of her life’s work. Wonderful additional resources about the Montessori Method, history, etc. are located here.

Since its formation in 1960, the American Montessori Society (AMS) has grown to be the largest Montessori organization in the world. AMS is a non-profit, non-discriminatory service organization dedicated to encouraging and supporting the use of the Montessori teaching approach in private and public schools.

The Montessori Training Center of Minnesota (MTCM) offers a complete course of study for those seeking a fulfilling career as a preschool Montessori teacher. There are also great additional resources at the MTCM’s website.

The Director of Training at MTCM, Molly O’Shaughnessy, has given talks and workshops around the country and world. Here is an outstanding talk entitled “The Century Forward: A Vision of the Montessori Movement for the Next Century”