Clark is Pam's lactation consultant in the season 6 episode "The Delivery (Part 2)", portrayed by Lee Kirk, Jenna Fischer's husband in real life. A nurse named Josie suggested that Pam need a lactation consultant because of her struggles to breastfeed. At first, Jim thinks that the lactation consultant is a woman and asks when she is available. However, Clark explains that he is the lactation consultant. Jim said it was "really great" that Clark showed up, although after Clark leaves, Pam starts to have trouble breastfeeding again and doesn't feel comfortable having Jim help her. Clark has a bad sense of humor, coming into the hospital room saying "got milk?" and laughing at his own joke.

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