In 1916 he and his wife Kate moved to Oxford where Dreyer worked on his 15 volume edition of the works of Tycho Brahe, the last volume of which was published after his death.
Στα 1916 μετακόμισε μαζί με την σύζυγό του Kate στην Οξφόρδη όπου και συνέταξε σε δεκαπέντε τόμους τα έργα και τα γραπτά του Τύχο Μπράχε (Tycho Brahe).