TYB!
Brennan follows 33 Twitter accounts.
One of them is
James J. Martin
SJ stands for Society of Jesus, also known as Jesuit Order.
https://en.wikipedia.org/wiki/James_Martin_(priest,_born_1960)
https://twitter.com/JamesMartinSJ
https://twitter.com/JohnBrennan/following
author of “Building a Bridge”
https://www.harpercollins.com/9780062873446/building-a-bridge/
https://twitter.com/KarluskaP/status/1237114769347354625