Joe O'Connor plays Clarissa's dad, Marshall Darling, an architect of retail buildings that often had punny names. He almost exclusively called Clarissa by a nickname — Sport. While he did offer parental advice from time to time, he was not the go-to parent for the kids. O'Connor admitted he had more reservations about a neighbor boy climbing into Clarissa's window than his character apparently did. 

After his 65 episodes playing Marshall Darling, he once again teamed up with Hart when he appeared on one episode of "Sabrina the Teenage Witch." He has been super busy guest starring on various TV shows since the mid-'90s, including a couple of episodes of "The Practice" and "The West Wing." In the early 2000s, he had a six-episode arc as Tom Vogel on "Mad Men." He has also rounded out his career with several TV movies, short films, and features.

O'Connor's personal life must be very personal indeed. He does not have a large internet presence, and most biography sites only list his acting credits and have very little information to share about him beyond this.

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