IN: A.J. Quartermaine is a fictional character from General Hospital, an American soap opera on the ABC network. Born on-screen in 1979 as the only biological child of the iconic Drs Alan and Monica Quartermaine, A.J. was SORASed in 1991, revising his birth year to 1972. The role has been most notably portrayed by actors Sean Kanan from 1993 to 1997, and Billy Warlock from 1997 to 2003, with a brief return in 2005. Kanan made his on-screen return as A.J. on October 26, 2012, after a 15-year absence.

The newborn A.J. was portrayed by child actor Eric Kroh from 1979 to 1983. Abraham Geary briefly stepped into the role in 1983. The role was also portrayed by Jason Marsden (1986-1988), Christopher Nelson (1988), Justin Whalin (April 1988 - 1989). On June 20, 1991, Gerald Hopkins stepped in the role of A.J. on contract and last appeared on December 30, 1992. The role was recast with Sean Kanan, who made his first appearance in the role on February 16, 1993. Kanan last appeared in the role on June 10, 1997. Kanan received a nomination for the Soap Opera Digest Award for Best Newcomer for his portrayal of A.J. in 1994.  Following Kanan's departure, actor Billy Warlock was hired for the role of A.J., and he made his debut on June 13, 1997. In 2003, Warlock earned a pre-nomination for the Daytime Emmy Award for Outstanding Supporting Actor in a Drama Series for his portrayal of A.J.. Warlock departed from the series in December 2003, amongst rumors that he was fired after disputes with show executives; the network replied his exit was due to lack of storyline.  In early 2005, the network's announcement of Warlock's return as A.J. was briefly put on hold, speculated as contract disputes. Warlock's return first aired on February 4, 2005, and shortly thereafter Warlock announced his return to the NBC soap opera Days of Our Lives as Frankie Brady. Warlock's exit lead to rumors of Kanan's possible reprisal of the role, who had recently announced move to recurring status in his role as Deacon Sharpe in the CBS Daytime soap opera The Bold and the Beautiful. Warlock exited the series in April 2005 and the character was killed off.  On September 17, 2012, Kanan revealed in an interview with TV Guide's Michael Logan that he was put on contract with General Hospital, but his character was not being announced. Rumors arose that Kanan might replace Steve Burton in the role of A.J.'s brother, Jason Morgan; the resemblance between the two fed into the rumors. Kanan first appeared on October 26, revealed to be A.J., retconing the character's death. On March 17, 2014, it was announced that Kanan would once again be leaving the role of A.J.

Were there any other actors?

OUT: actor Billy Warlock was hired for the role of A.J., and he made his debut on June 13, 1997.

input: Supported by Guggenheim and university grants, Partch took up residence at the University of Wisconsin from 1944 until 1947. This was a productive period, in which he lectured, trained an ensemble, staged performances, released his first recordings, and completed his book, now called Genesis of a Music. Genesis was completed in 1947 and published in 1949 by the University of Wisconsin Press. He left the university, as it never accepted him as a member of the permanent staff, and there was little space for his growing stock of instruments.  In 1949, pianist Gunnar Johansen allowed Partch to convert a smithy on his ranch to a studio. Partch worked there with support from the Guggenheim Foundation, and did recordings, primarily of his Eleven Intrusions (1949-1950). He was assisted for six months by composer Ben Johnston, who performed on Partch's recordings. In spring 1951, Partch moved to Oakland for health reasons, and prepared for a production of King Oedipus at Mills College, with the support of designer Arch Lauterer. Performances of King Oedipus in March were extensively reviewed, but a planned recording was blocked by the Yeats estate, which refused to grant permission to use Yeats's translation.  In February 1953, Partch founded the studio Gate 5 in an abandoned shipyard in Sausalito, California, where he composed, built instruments and staged performances. Subscriptions to raise money for recordings were organized by the Harry Partch Trust Fund, an organization put together by friends and supporters. The recordings were sold via mail order, as were later releases on the Gate 5 Records label. The money raised from these recordings became his main source of income. Partch's three Plectra and Percussion Dances, Ring Around the Moon (1949-1950), Castor and Pollux, and Even Wild Horses, premiered on Berkeley's KPFA radio in November 1953.  After completing The Bewitched in January 1955, Partch tried to find the means to put on a production of it. Ben Johnston introduced Danlee Mitchell to Partch at the University of Illinois; Mitchell later became Partch's heir. In March 1957, with the help of Johnston and the Fromm Foundation, The Bewitched was performed at the University of Illinois, and later at Washington University in St. Louis, though Partch was displeased with choreographer Alwin Nikolais's interpretation. Later in 1957, Partch provided the music for Madeline Tourtelot's film Windsong, the first of six film collaborations between the two. From 1959 to 1962, Partch received further appointments from the University of Illinois, and staged productions of Revelation in the Courthouse Park in 1961 and Water! Water! in 1962. Though these two works were based, as King Oedipus had been, on Greek mythology, they modernized the settings and incorporated elements of popular music. Partch had support from several departments and organizations at the university, but continuing hostility from the music department convinced him to leave and return to California.

Answer this question "did he work with anybody?"
output:
He was assisted for six months by composer Ben Johnston, who performed on Partch's recordings.