Episodeless entries - Genshiken (OVA)

We lack information on which episodes the following appear in:

1. Episode 13: My Name Is Ogiue and I Hate Otaku
Episodic: William Hirsh (Takayanagi)
2. Episode 14: I Am from the Planet Otaku
Recurring: Kenneth Robert Marlo (Makoto Kosaka)
Incidental: Bob Senkewicz (Sushi Chef), Sarah Pesek (Saki's Friend)
Additional Voices: Jennifer Lauren Scott, Sarah Pesek
3. Episode 15: Then I'll Undress You!
Recurring: Kenneth Robert Marlo (Makoto Kosaka)
Incidental: Tom Wayland (Cameraman)