From 1954 onward he appeared in more than a hundred roles[5] at the Oslo New Theater, including The White Horse Inn (Norwegian title: Sommer i Tyrol) and as Snoopy in You're a Good Man, Charlie Brown (Norwegian title: Knøttene).

He played the role of Jamie in My Fair Lady in the 1960s, appearing alongside Helge Reiss and Henki Kolstad.

/ Og godteri spiser vi bare til fest, / sånn en gang i uka er best.

Wengård reprised the role of the postman in the children's television show Jul i Skomakergata in 1979 and sporadically over the years that followed.

[6] For his volunteer work in the press tribune, he received the Ski Association's plaque of honor.