I was a bit puzzled about the "academic" part, but found out that Pearce had become one in 2001, coinciding with his move to the US (when he was 40).
Pearce had published at least ten
books before his move to the US and into academia, including two on JRRT: the 1998 "
Tolkien: Man and Myth" (which I own), and the 1999 "Tolkien: A Celebration".
Pearce shares a biographical detail with JRRT in being a convert to Roman Catholicism, though in Pearce's case this was at the age of 28, rather than 8 for JRRT.
His book "
Bilbo's Journey" mentioned by
@Ent above is from 2012. In 2015, he published "
Frodo's Journey", with an analogous subtitle.