Vincent Paul Kartheiser (born May 5, 1979) is an American actor. He played Pete Campbell on the AMC television series Mad Men, for which he received six Screen Actors Guild Award nominations for Outstanding Performance by an Ensemble in a Drama Series and won twice along with the cast. He had starring roles in the films Alaska, Masterminds, and Another Day in Paradise.

Kartheiser also played Connor on The WB television series Angel and Dr. Jonathan Crane in the third season of the HBO series Titans.

Early life
Kartheiser was born in Minneapolis, Minnesota, the son of Janet Marie (née Gruyé), who ran a nursery, and James Ralph Kartheiser, who sold construction equipment.

The youngest of six children, he has four sisters, Andrea, Colette, Elise and Theresa, and a brother, Nathan. He is of Luxembourgish, German, and to an extent Polish, Finnish, and Swedish ancestry. Kartheiser attended Apple Valley High School in Apple Valley, Minnesota, but dropped out at age 15 because he "wanted to make money."