Johan Christian Fabricius | Johan Galtung | Ted Jensen | Luke Jensen | Johan Petter Johansson | Johan Norberg | Johan Niclas Byström | Johan Museeuw | Johan Henric Kellgren | Johan de Witt | Jensen | Johan Jeremiassen | Johan Gunnar Andersson | Johan Cruyff | Johan Bojer | David Jensen | Anders Thomas Jensen | Viggo Jensen | Nils Johan Berlin | Johan Wohlert | Johan Vande Lanotte | Johan Svendsen | Johan Reinhard | Johan Jakobsson | Johan Ferrier | Johan Falkberget | Johan de Meij | Johan Banér | James A. Jensen | George Jensen |
He was a member of the Danish Mathematicians' Association (TBMI) and through this met amateur mathematician Johan Jensen, the Chief Engineer of the Copenhagen Telephone Company (KTAS in Danish), an offshoot of the International Bell Telephone Company.