Leo was one of a pair of wealthy possible donors in the Season 5 episode Both Sides Now. He was portrayed by actor Jason Boegh.
Leo's partner John was discussing their gratitude to the hospital in their response to Leo's burst appendix when they are interrupted by Eugene Schwartz who House told to bring a stool sample directly to Cuddy.
| Season 5 | |||||
| #01 | "Dying Changes Everything" | #09 | "Last Resort" | #17 | "The Social Contract" |
| #02 | "Not Cancer" | #10 | "Let Them Eat Cake" | #18 | "Here Kitty" |
| #03 | "Adverse Events" | #11 | "Joy to the World" | #19 | "Locked In" |
| #04 | "Birthmarks" | #12 | "Painless" | #20 | "Simple Explanation" |
| #05 | "Lucky Thirteen" | #13 | "Big Baby" | #21 | "Saviors" |
| #06 | "Joy" | #14 | "The Greater Good" | #22 | "House Divided" |
| #07 | "The Itch" | #15 | "Unfaithful" | #23 | "Under My Skin" |
| #08 | "Emancipation" | #16 | "The Softer Side" | #24 | "Both Sides Now" |