EdVista isn't a company.

For Marc Siskin and Claire Bradin Siskin, it is their "home on the Internet." They chose the domain "EdVista" because

1. it wasn't already taken;
2. it reflects their "vista" of the Internet and how it might be used as an educational tool.

You may reach Marc at msiskin at edvista dot com and Claire at csiskin at edvista dot com.