The National Science Teachers Association (NSTA), founded in 1944 and headquartered in Arlington, Virginia, is an association of science teachers in the United States and is the largest organization of science teachers worldwide. NSTA's current membership of more than 57,000 includes science teachers, science supervisors, administrators, scientists, business and industry representatives, and others involved in and committed to science education. The organization's mission is to "to promote excellence and innovation in science teaching and learning for all." The color of the emblem is not fixed.
http://www.nsta.org/
National Science Teachers Association
1840 Wilson Blvd. 
Arlington VA 22201
Main number: 703.243.7100 

Fax: 703.243.7177