Richard H Langley
Richard Langley, PhD, also teaches chemistry at Stephen F. Austin State university and is a grader for the AP Chemistry exam. John T. Moore, EdD, teaches chemistry at Stephen F. Austin State University in Austin, TX.
Richard Langley, PhD, also teaches chemistry at Stephen F. Austin State university and is a grader for the AP Chemistry exam. John T. Moore, EdD, teaches chemistry at Stephen F. Austin State University in Austin, TX. See less