Mr. Galvin is rarely seen smiling. The most recent time in Big Nate we see him smiling was in Big Nate On A Roll.
Mr. Galvin is in love with Greta Van Susteran.
He has been teaching at P.S 38 for a long time.
He has a collection of patatoes shaped like famous scientists.
He was nicknamed "proffessor chuckles" by Nate.
He is also the advisor of the Science Club.
Nate also named him "G-rex"
Mr. Galvin is also said to have a "40 year old cologne", as said in Big Nate Goes for Broke.