Critics often dismissed his work as dependable yet uninspired,[1] however many of his light-hearted comedies achieved great popularity in Denmark.
Gregers most notable films were romantic comedies starring his wives Bodil Ipsen and Marguerite Viby.
Around 1909, he moved to Copenhagen and performed in the larger theaters including Norrebros Teater and the Betty Nansen Teatret.
Although he quickly shifted to working in film in 1912, Gregers maintained a lifelong attachment to stagework: he owned the Casino theater in Copenhagen and managed it from 1921 to 1931, then continued as a stage director into the 1940s.
The most notable were his folk comedies:[2] the wacky 1937 romantic comedy Mille, Marie of mig (Milly, Maria and Me), in which his then current wife, Marguerite Viby, and the most popular Danish comedienne of the 1930s, played three roles; 1938's Bolettes brudeafærd (Bolettes Bridal Party), which starred his former wife Bodil Ipsen as a sharp-tongued spinster; the witty period comedy Sørensen og Rasmussen which starred both his former wives, Viby and Ipsen; and the 1941 backstage musical, Alle gaar rundt og forelsker sig (Everyone's Falling in Love) -- in which a small part was played by Greger's third wife, Ruth Saabye.
His final marriage was to Ruth Egede Saabye who played minor roles in Greger's films in the early 1940s.