Eric Marcos is a sixth grade mathematics teacher at Lincoln Middle School in Santa Monica, CA. Eric integrates purposeful-technology with a “kids teaching kids” model. Using screencasting software, Eric’s students create math video lessons, called mathcasts, which are used in classroom instruction and for the class podcast. He created the Web site Mathtrain.com, where students actively collaborate on-line and the video site Mathtrain.TV. The site was recently featured on EuroNews to over 150 countries and in 11 languages. Recently, Eric launched the free student site, StudentCreated.TV. Eric attended Boston College and earned his Master of Education degree in the MidCareer Math and Science Program at the Harvard Graduate School of Education. He has taught in East Boston and San Diego public middle schools.