[PAR] [TLE] Johnny Galecki [SEP] John Mark Galecki (born April 30, 1975) is an American actor.  He is known for playing David Healy in the ABC sitcom "Roseanne" from 1992 to 1997 and Dr. Leonard Hofstadter in the CBS sitcom "The Big Bang Theory" since 2007.  Galecki also appeared in the films "National Lampoon's Christmas Vacation" (1989), "Prancer" (1989), "Suicide Kings" (1997), "I Know What You Did Last Summer" (1997), "Bookies" (2003), and "In Time" (2011). [PAR] [TLE] National Lampoon's Christmas Vacation [SEP] National Lampoon's Christmas Vacation is a 1989 American Christmas comedy film directed by Jeremiah S. Chechik.  It is the third installment in National Lampoon's "Vacation" film series, and was written by John Hughes, based on his short story in "National Lampoon" magazine, "Christmas '59".  The film stars Chevy Chase, Beverly D'Angelo and Randy Quaid, with Juliette Lewis and Johnny Galecki as the Griswold children Audrey and Rusty, respectively.
[PAR] [TLE] Johnny Galecki [ SEP ] John Mark Galecki ( born April 30 , 1975 ) is an American actor . He is known for playing David Healy in the ABC sitcom " Roseanne " from 1992 to 1997 and Dr. Leonard Hofstadter in the CBS sitcom " The Big Bang Theory " since 2007 . Galecki also appeared in the films " National Lampoon 's Christmas Vacation " ( 1989 ) , " Prancer " ( 1989 ) , " Suicide Kings " ( 1997 ) , " I Know What You Did Last Summer " ( 1997 ) , " Bookies " ( 2003 ) , and " In Time " ( 2011 ) . [PAR] [TLE] National Lampoon 's Christmas Vacation [ SEP ] National Lampoon 's Christmas Vacation is a 1989 American Christmas comedy film directed by Jeremiah S. Chechik . It is the third installment in National Lampoon 's " Vacation " film series , and was written by John Hughes , based on his short story in " National Lampoon " magazine , " Christmas ' 59 " . The film stars Chevy Chase , Beverly D'Angelo and Randy Quaid , with Juliette Lewis and Johnny Galecki as the Griswold children Audrey and Rusty , respectively .
National Lampoon's Christmas Vacation is a film that stars an actor known for playing Dr. Leonard Hofstadter in what CBS sitcom?
National Lampoon 's Christmas Vacation is a film that stars an actor known for playing Dr. Leonard Hofstadter in what CBS sitcom ?
The Big Bang Theory
The Big Bang Theory