Is Dragon Ball z and Dragon Ball gt made by the same person

yes, but it has some different sponsor plus the creator, Akira Toriyama, had made DBZ and wanted to end it but Ataria, a sponsor, made Toriyama do dragon ball gt, and that is why he made it short (64 episodes.) Also if you want to know Akira, Toriyama was going to make a dragon ball af or something but changed his mind because people kept asking him when dragon ball af or another title would come out and he got so angry he decided to end the dragon ball series with dragon ball gt and if you ever hear that dragon ball af is real and you can watch it its probably something that will give you a virus or a tracking cookie (especially zango, never believe in zango, it is not good and is annoying, yes you have to download it.) Dragon ball af is fan made but is pretty nice and exciting to watch such as seeing gohan super saiyan 4. !