Top 2 in Top 10 smartest characters in anime Dr.Stone.
Xeno Wingfield was one of NASA's scientists before all of humanity was petrified. What makes him special is, he used to be Senku's teacher even when they didn't meet face to face. Since then, Xeno realizes how smart Ishigami Senku really is.
Intellectual property is comparable to Senku. Xeno Wingfield was first introduced as a villain who wanted to destroy Senku. Xeno wants to rule the Stone World, but Senku wants to revive the old civilization, through science. After his defeat against Senku, Xeno had no choice but to help Senku with everything he knew. Despite losing to Senku, Xeno's knowledge is still more or less superior to Senku