Biography about a watch inventor???

Hello! My son needs to read a biography for school he is very into watches lately and wanted to learn about either Peter Henlein(mechanical watch inventor) or Abraham-Louis Perrelet(automatic watch inventor). I cant seem to find any biographies in book form on these guys. The book does not have to be for kids. The two Canadian quartz watch inventors would be fine too but that’s not his first preference

by westcoastlass