Bill Bryson Quotes
Before, prior to. There is no difference between these two except length and a certain affectedness on the part of 'prior to.' To paraphrase Bernstein, if you would use 'posterior to' instead of 'after,' then by all means use 'prior to' instead of 'before.
Bryson, Bill. Bryson's Dictionary of Troublesome Words: A Writer's Guide to Getting It Right. Broadway Books, 2002.
William McGuire Bryson OBE HonFRS is an American–British author of books on travel, the English language, science, and other non-fiction topics. Born in the United States, he has been a resident of Britain for most of his adult life, returning to the U.S. between 1995 and 2003, and holds dual American and British citizenship. He served as the chancellor of Durham University from 2005 to 2011.