David has been a pioneer in online conferencing for over 25 years. In 1973 he created PLATO Notes, one of the world's first conferencing systems and the direct progenitor of Lotus Notes, DEC Notes, and many others. He has designed conferencing facilities for many applications and has published a number of articles and book chapters on the subject.

As the Executive Director of Twin Cities Free-Net, David spearheaded the building of an online community designed to support the neighborhoods of the Minneapolis - St. Paul metro area. For several years he has served on the board of Minnesota E-Democracy, an internationally renowned organization that uses Internet technology to engage citizens in local political discussions.

For several years he has maintained a well-known, comprehensive index of software products and services for online conferencing at thinkofit.com.