Following his graduation from Northwestern, Hassler joined the staff of WMAQ radio in Chicago, where he worked as a record librarian and program builder.
Don Quixote | Don Giovanni | Don Cherry | Don | Don (honorific) | Don Cheadle | Rostov-on-Don | Don Williams | Don Juan | Don Knotts | Don Imus | Don Carlos | Don Rickles | Don Omar | Don Henley | Salesians of Don Bosco | Don Johnson | Don Drysdale | Don Pasquale | Don Messick | Don Bluth | Don King (boxing promoter) | Don King | Don Shula | Don LaFontaine | Don Cherry (jazz) | Don Burrows | Don't Look Now | Don Siegel | Don McLean |