Question: Are Joe Gittleman and Billy Gibbons of the same nationality?

Context articles: Got Me Under Pressure
Social Distortion Winter 2012 Tour
Come All You Madmen
Billy Gibbons
Moving Sidewalks
The Mighty Mighty Bosstones
Fluent in Stroll
ZZ Top
Joe Gittleman
Avoid One Thing

"Got Me Under Pressure" is a song by ZZ Top from their 1983 album "Eliminator".
 The song was produced by band manager Bill Ham, and recorded and mixed by Terry Manning.
 David Blayney (ZZ Top's stage manager of 15 years), in his book "Sharp Dressed Men" described how the song was pre-produced: Billy Gibbons and Linden Hudson (Houston engineer and songwriter) wrote the whole song and created a recorded demo all in one afternoon without either Dusty Hill (ZZ Top bass player) or Frank Beard (ZZ Top drummer) even knowing about it.
 Linden created the bass on a synthesizer, created drums on a drum machine and helped Billy Gibbons write the lyrics; Billy performed the guitars and vocals.
The Winter Tour (also known as "House of Blues Residency" was a tour by Social Distortion.
 As its name applies, most of the shows were based out of the House of Blues in Orange County (Anaheim, San Diego, West Hollywood) with a couple of shows heading out to Las Vegas and Tempe, Arizona.
 Even though similar, this tour was not a part of the Hard Times and Nursery Rhymes tour, as most of the material played here was pulled from most of the band's catalog.
 This is also not the first time Social Distortion has done a tour like this, it has been done before numerous times since 2001.
 As with previous House of Blues tours, the band played rare songs and new songs and brought out guests this time, such as Billy Gibbons and Mike Ness' own son Julian Ness.
 They also brought out Eric "Jailhouse Blues" Von Herzen who played harp for "It Coulda Been Me" and "Drug Train" on Social Distortion (album) and they also played ZZ Top's La Grange (song) with Billy Gibbons.
 The band also premiered songs like "Far Side of Nowhere", "Writing On the Wall" and performed songs that have not been played in a while like "It Coulda Been Me", "99 to Life", "Footprints On My Ceiling", "Hour of Darkness", "Diamond In the Rough" and even played the White Light, White Heat, White Trash album in its entirety at some shows.
Come All You Madmen is the fourth album from Los Angeles-based punk rock band The Briggs.
 The album was released June 17, 2008 through SideOneDummy Records and was produced by The Mighty Mighty Bosstones' Joe Gittleman, as with their previous album "Back to Higher Ground".
William Frederick Gibbons (born December 16, 1949) is an American musician, singer, songwriter, producer, and actor, best known as the guitarist and lead vocalist of the American rock band ZZ Top.
 He began his career in the Moving Sidewalks, who recorded "Flash" (1968) and opened four dates for the Jimi Hendrix Experience.
 Gibbons formed ZZ Top in late 1969 and released "ZZ Top's First Album" in 1971.
 The albums that followed, "Rio Grande Mud" (1972) and "Tres Hombres" (1973), along with extensive touring, solidified the group's reputation as a hard-rocking power trio.
The Moving Sidewalks was an American psychedelic blues rock band, most notable for giving future ZZ Top guitarist, Billy Gibbons, his start in the music business.
 The band consisted of Gibbons on guitar, Don Summers on bass, Dan Mitchell on drums and Tom Moore on keyboards.
The Mighty Mighty Bosstones (stylized as The Mighty Mighty BossToneS; informally referred to as The Bosstones) are an American ska punk band from Boston, Massachusetts, formed in 1983.
 Since the band's inception, lead vocalist Dicky Barrett, bassist Joe Gittleman, tenor saxophonist Tim "Johnny Vegas" Burton and dancer ("Bosstone") Ben Carr have remained constant members.
 The line-up also includes drummer Joe Sirois, saxophonist Leon Silva, guitarist Lawrence Katz and trombonist Chris Rhodes.
Fluent In Stroll is the seventh studio album by the Boston ska punk band Big D and the Kids Table, released on July 7, 2009 by Side One Dummy Records.
 It was produced by Joe Gittleman of The Mighty Mighty Bosstones and features backing vocals by Sirae Richardson, Hayley Jane, and Nicole and Simone Olivia, who perform as the Doped Up Dollies.
 Its title refers to the band's new musical direction dubbed "stroll", a mix of double-Dutch, ska, reggae, and soul.
ZZ Top is a rock band formed in 1969 in Houston, Texas.
 The band has, since 1970, consisted of bassist and lead vocalist Dusty Hill, guitarist and lead vocalist Billy Gibbons (the band's leader, main lyricist and musical arranger), and drummer Frank Beard.
 "As genuine roots musicians, they have few peers," according to former musician, critic and collector Michael "Cub" Koda.
 "Gibbons is one of America's finest blues guitarists working in the arena rock idiom [...] while Hill and Beard provide the ultimate rhythm section support."
Joe Gittleman (born April 6, 1968 in Cambridge, Massachusetts) is an American musician, best known as the bass guitar player for The Mighty Mighty Bosstones.
 His proficiency on bass earned him the nickname "the Bass Fiddleman."
Avoid One Thing was started as a side project by The Mighty Mighty Bosstones' bassist Joe Gittleman.
 The Boston-based group's first album, titled "Avoid One Thing", was released in 2002 on Side One Dummy Records.
 The album was written and recorded almost solely by Gittleman.
 Gittleman assembled a band with which to tour and play his music.
 Before the release of the band's next album in 2004, the band went through several lineup changes.
 John Lynch joined the band after Dave Karcich's death due to a sudden brain aneurysm.
 Later, Delano left and the band continued as a three-piece.
 The trio returned to the studio and released "Chopstick Bridge" on May 4, 2004.
 The album reflected the combined efforts of all three band members and sounds vastly different from their first in many respects; Amy Griffin and Gittleman even split lead vocals on a few tracks.
 After the release of this album, the band toured until February 2005 before going on hiatus.
 Since that time, Griffin has been playing guitar for Darkbuster and Gittleman has moved to Los Angeles and is once again a member of the reunited Bosstones.
 Paul Delano underwent emergency surgery in 2006 and a series of benefit shows were held.
 John Lynch has since joined up with David Minehan and is now playing drums for The Neighborhoods.