Wendy Haverford is Tom Haverford's ex-wife. She is a successful surgeon with a pediatric surgery fellowship. Tom and Wendy got married in college as a green card arrangement. Wendy and Tom were only seen together on rare occasions, the first in which is Rock Show. After the appropriate amount of time Tom Haverford and Wendy announce their divorce (Tom's Divorce.) Wendy then follows her interest in dating Ron Swanson, in which Tom is not happy about. In Ron & Tammy: Part 2, Wendy tells Ron that she is leaving to go back to Canada. Tom show's up to a party Leslie is throwing for the Pawnee Police Department with Tammy Swanson (Tammy II), which then leads to Ron and Tammy getting married for a second time.
Ron and Wendy begin a relationship in Season 3, which troubles her ex-husband Tom so much that his girlfriend Lucy breaks up with him. In "Ron & Tammy: Part 2", Ron's ex-wife Tammy 2 continues her efforts to sabotage his life, but the normally susceptible Ron easily resists her seductions because he is now in a solid relationship with Wendy.
Later, however, Wendy and Ron break up after she announces she is moving back to Canada to be closer to her parents. She asks if Ron would want to move up there with her, and he laughs at the idea.