shot by a crazed gunman credited as "Moriarty", the name of Holmes's nemesis. In the season four episode "It's a Wonderful Lie", House receives a "second-edition Conan Doyle" as a Christmas gift. In the season five episode "The Itch", House is seen picking up his keys and Vicodin from the top of a copy of Conan Doyle's The Memoirs of Sherlock Holmes. In another season five episode, "Joy to the World", House, in an attempt to fool his team, uses a book by Joseph Bell, Conan Doyle's inspiration for Sherlock Holmes. The volume had been given to him the previous Christmas by Wilson, who included the message "Greg, made me think of you." Before acknowledging that he gave the book to House, Wilson tells two of the team members that its source was a patient, Irene Adler. Season 7 episode 3 includes a young adult boyhood detective book series written by the patient, whose final unpublished volume ends in an ambiguous end to the main character reminiscent of "The Final Problem". The series finale also pays homage to Holmes's apparent death in "The Final Problem", the 1893 story with which Conan Doyle originally intended to conclude the Holmes chronicles. Production team House was a co-production of Heel and Toe Films, Shore Z Productions, and Bad Hat Harry Productions in association with Universal Network Television for Fox. Paul Attanasio and Katie Jacobs, the heads of Heel and Toe Films; David Shore, the head of Shore Z Productions; and Bryan Singer, the head of Bad Hat Harry Productions, were executive producers of the program for its entirety. Lawrence Kaplow, Peter Blake, and Thomas L. Moran joined the staff as writers at the beginning of the first season after the making of the pilot episode. Writers Doris Egan, Sara Hess, Russel Friend, and Garrett Lerner joined the team at the start of season two. Friend and Lerner, who are business partners, had been offered positions when the series launched, but turned the opportunity down. After observing the show's success, they accepted when Jacobs offered them jobs again the following year. Writers Eli Attie and Sean Whitesell joined the show at the start of season four; Attie would stay on the show's writing staff through the series finale, which he co-wrote. From the beginning of season four, Moran, Friend, and Lerner were credited as executive producers on the series, joining Attanasio, Jacobs, Shore, and