Question: What is the nationality of the actor who played Leonard Hofstadter's colleague and best friend?

Context articles: Johnny Galecki
Jim Parsons
Rapper's Best Friend 3
Rock Me Baby (TV series)
Sexxx
My Best Friend's Girl (novel)
Penny (The Big Bang Theory)
Obelix
Larry Fleinhardt
Leonard Hofstadter

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).
James Joseph Parsons (born March 24, 1973) is an American actor.
 He is known for playing Sheldon Cooper in the CBS sitcom "The Big Bang Theory".
 He has received several awards for his performance, including four Primetime Emmy Awards for Outstanding Lead Actor in a Comedy Series and the Golden Globe Award for Best Actor in a Television Series Musical or Comedy.
Rapper's Best Friend 3 is the third installment in musician and producer The Alchemist's instrumental series "Rapper's Best Friend", and Alchemist's 10th instrumental release.
 The other two albums in the series, "Rapper's Best Friend" and "Rapper's Best Friend 2", were released in 2007 and 2012, respectively.
Rock Me Baby is an American television series set in Denver, Colorado.
 It is a comedy / drama that debuted on September 15, 2003 on UPN.
 "Rock Me Baby" stars actor and comedian Dan Cortese as Jimmy Cox, co-host of a popular Denver radio show with his best friend, Carl, played by Carl Anthony Payne II.
 Bianca Kajlich plays Beth Cox, Jimmy's wife, and the two have a baby named Otis.
 Tammy Townsend plays Beth's best friend, Pamela, who is obsessed with the glamorous life.
Sexxx is a British comedy television series, which airs on a Tuesday night.
 The programme was launched on 27 November 2012 and consists of seven episodes, and was written by Paul Chaplin.
 The premise of the show is that of a sitcom based in a Soho sex shop run by former porn star Ben Dover as the senior partner, played by Lyndsay Honey, with his best friend 'Pauly', played by Chaplin, as his younger and more naive colleague.
 The theme is loosely based upon the 1970s Open All Hours BBC comedy series.
 "Sexxx" is broadcast on satellite television and online.
My Best Friend's Girl is a 2006 novel by Dorothy Koomson.
 The book is based around a woman called Kamryn Matika, who finds out her best friend, Adele, is dying of cancer.
 Adele wants Kamryn to adopt her five-year-old daughter, Tegan after she dies.
 The book deals with themes of death and grief, innocence and forgiveness.
 The title is drawn from the 1976 song "My Best Friend's Girl" by The Cars.
Penny is a fictional character on the American CBS sitcom "The Big Bang Theory", portrayed by actress Kaley Cuoco.
 She is the primary female character in the series, befriending her across-the-hall neighbors Leonard Hofstadter (Johnny Galecki) and Sheldon Cooper (Jim Parsons), two physicists who work at the nearby California Institute of Technology (Caltech).
 Penny's lack of advanced education, but outgoing personality and common sense drastically contrast with the personalities of the primary male characters in the series, even though she is considered part of their group.
 She is the love interest of Leonard, with whom she maintains a brief romantic relationship during the third season, which is later resumed in the fifth season and culminates in an engagement at the end of the seventh season and a wedding at the start of season 9.
 Penny is the only main character of the show whose last name has not been revealed, although she has been occasionally referred to or addressed with the last name Hofstadter since her wedding.
Obelix (Obélix in French) is a cartoon character and protagonist in the French comic book series Asterix.
 He works as a menhir sculptor and deliveryman, and is Asterix's best friend.
 Obelix is noted for his fatness, the menhirs he carries around on his back and his superhuman strength.
 He fell into a cauldron of the Gauls' magic potion when he was a baby, causing him to be the only Gaul in Asterix's village who is in a permanent state of superhuman strength.
 Because of this already enormous strength, Obelix is not allowed to drink the magic potion ever again, a ban he regards as being tremendously unfair.
 Other characteristics are his simplemindedness, his love and care for his dog Dogmatix, his anger when someone refers to him as being ""fat"", his enthusiasm for hunting and eating wild boars and beating up Romans.
 His catchphrase is: ""Ils sont fous ces romains"", which translates into "These Romans are crazy!"
, although he considers nearly every other nationality to be just as strange.
Larry Fleinhardt, Ph.D., is a fictional character in the CBS crime drama "Numb3rs", played by Peter MacNicol.
 He is the best friend and colleague of Charlie Eppes.
Leonard Leakey Hofstadter, Ph.D., is a fictional character in the CBS television series "The Big Bang Theory", in which he is portrayed by actor Johnny Galecki.
 Leonard is an experimental physicist, who shares an apartment with colleague and best friend Dr. Sheldon Cooper (Jim Parsons).
 For his portrayal, Galecki was nominated for a Primetime Emmy Award and a Golden Globe Award in 2011.