During her extensive career in Australian television Denise Morgan was involved as a writer, script editor and producer on some of Australia's most successful drama series. Among her early credits were shows from the mid to late-1970s, including Matlock Police (1976), Solo One (1976), Young Ramsey (1977-78), Chopper Squad (1978-79) and Prisoner (1979-81), which she also helped develop.
During the 1980s Morgan worked on Holiday Island (1981), Taurus Rising (1982), A Country Practice (1982), Five Mile Creek (1983), Home and Away (1988) and The Flying Doctors (1986-91). Her screenplay for the 1985 telemovie An Indecent Obsession - based on Colleen McCullough's novel of the same name, was also nominated for an Australian Film Institute (AFI) "Best Screenplay" award in 1985. Morgan's credits since 1990 include Phoenix (1992), Water Rats (1996-2000), Murder Call (1997-99), Medivac (1998), Stingers (1999), McLeod's Daughters (2003-05) and All Saints (2002-09).
In addition to her role as writer Morgan has been engaged as Script Editor for Young Ramsey, Water Rats, McLeod's Daughters and as Associate Script Producer for All Saints. Morgan was also Script Editor for the critically acclaimed 2004 feature film Somersault, and acted as story editor for Blue Heelers in 1994.