In 1895, he began performing as an actor and opera singer on stages in Bad Godesberg, Hagen and other cities of West Germany.
His first film as a director was Selbstgerichtet oder Die Gelbe Fratze[4] in which his wife Hedda Vernon was the lead actress.
He founded a film production company Moest-Film GmbH.
In April, 1922 after the failure of his film project he founded Aladin-Film Co. AG.
In 1923, he married Jewish Elly Charlotte Liepmann and after Adolf Hitler imposed restrictions on Jews, Moest led a very difficult life and worked as an assistant in the company Elekta-Film in Prague.