In 1967, Nyby became an assistant director for Ironside, and by 1972 received his first directing credits for Ironside episode "Find a Victim", and Adam-12 episode "The Tip". Nyby went on to direct multiple episodes of Emergency!, Battlestar Galactica, B. J. and the Bear, CHiPs, The A-Team, The Fall Guy, Hill Street Blues, Diagnosis: Murder and Walker, Texas Ranger. He directed the Tales of the Gold Monkey episode "Trunk From the Past", and the pilot episode of the unsold 1988 Remo Williams series. Nyby also directed numerous Perry Mason television movies in the late 1980s and early 1990s. Nyby's father, Christian Nyby, also a television director (as well as a film editor and director) directed multiple episodes of the original Perry Mason series.
