Roz is one of Will's colleagues at Doucette & Stein.
When Roz first appears, she seems to be in good terms with Will especially as they chat about the legal drama The Practice. She becomes bitter and resentful towards him when Mr. Stein shows favoritism towards him over the other employees, accusing Will of being a "kiss-ass".
In season 8, Roz is up for partner against Will and Gary. While at a dinner party with her boss Margot, Roz's husband Glenn reveals that she is pregnant despite Roz's protestations that she "might not keep it". Margot, who believes mothers are less productive in the workplace immediately drops Roz from the running to become partner and chooses Will instead.