He was appointed to a chair at Berlin Academy at the age of only 19. Frederick II asked him to revive the astronomical observatory of the Academy but this was not a task for which Johann(III) was particularly well suited.
Siya ay hihirangin upang angkinin ang isang upuan sa Berlin Academy sa edad na 19 lamang. Frederick II nagtanong sa kanya upang muling buhayin ang astronomya obserbatoryo ng mga Academy ngunit ito ay hindi isang gawain na kung saan Johann (III) ay lalo ng mabuti angkop.