I think there is a good possibility that this might be your guy. He is based out of Texas according to the article.

Sorry it wouldn’t let me copy a link.

Assistant Professor, Department of Human and Organizational Development
Research: Professor Diehl’s research focuses on how the opportunity structures and cultural logics of schools and school practices shape, and are in turn shaped by, social networks and relationships. He is especially interested in how these dynamics play out during school change efforts as reformers attempt to instantiate contested moral ideals about how teachers and students ought to live and learn together.

His work has focused on issues such as: how differences in organizational contexts can explain varying levels of segregation, hierarchy and clustering in adolescent school networks; using streaming discourse data to model variation in classroom interactional order in terms of the dynamic relationship between activity structures and forms of talk; and a case study of a failed small school reform explained in terms of the difficulty not of changing teachers’ minds about their practice, but rather the structural and phenomenological nature of their relationships with each other and with their students

David Diehl
David Michael Diehl is a former American football offensive lineman who played his entire career with the New York Giants of the National Football League. He was the Giants starting left tackle on two Super Bowl championship teams, beating the New England Patriots in both games. He played college football for the University of Illinois. The Giants selected him in the fifth round of the 2003 NFL

hmmm...wonder if it's the same David Diehl...