Question: Which record producer, born on August 23, 1951 in Portland, Oregon, worked with Ringo Starr to produce his single, "Liverpool 8"?

Context articles: Liverpool 8
Live at the Greek Theatre 2008
Back Off Boogaloo
Maureen Starkey Tigrett
The Beatles at The Cavern Club
Goodnight Vienna
Liverpool 8 (song)
It Don't Come Easy
Albert Starr
Mark Hudson (musician)

Liverpool 8 is the fifteenth studio album by Ringo Starr, released worldwide on 14 January 2008.
 Received with mixed reviews, it marks Starr's return to EMI for the first time since leaving the label in 1975, following the end of The Beatles' recording contract with the company.
Live at the Greek Theatre 2008 is a live album released by musician Ringo Starr & His All-Starr Band in 2010.
 It is one of few current albums that Ringo Starr has released on a major label, this one being released on Universal Music Group, as well as his 2008 studio album "Liverpool 8", which was released under Capitol Records.
 One of the reasons that this particular live album might have been released on a more popular label is because the Greek Theatre (located in Los Angeles) is more of a bigger venue then some of Ringo's other concert locations.
 The album oddly removes many of the songs that were sung at the concert.
 On the filmed concert, also included with the CD, there are several more songs.
 Such examples are Edgar Winter's "Frankenstein" and what would have been an obvious choice for the album, a live version of Ringo Starr's "Liverpool 8" song.
 Also, there is a sing-along version of John Lennon's "Give Peace a Chance".
 News of the album was originally revealed on the Beatles' official website as well as Ringo's official website.
"Back Off Boogaloo" is a song by English musician Ringo Starr, released as a non-album single in March 1972.
 Starr's former Beatles bandmate George Harrison produced the recording, which took place in London shortly after the two had appeared together at Harrison's Concert for Bangladesh shows in August 1971.
 The single was a follow-up to Starr's 1971 hit song "It Don't Come Easy" and continued his successful run as a solo artist.
 "Back Off Boogaloo" peaked at number 2 in Britain and Canada, and number 9 on America's "Billboard" Hot 100.
 It remains Starr's highest-charting single in the United Kingdom.
Maureen "Mo" Starkey Tigrett (born Mary Cox; 4 August 1946 – 30 December 1994) was a hairdresser from Liverpool, England, best known as the first wife of Ringo Starr, the Beatles' drummer.
 When she was a trainee hairdresser in Liverpool, she met Starr at The Cavern Club, where the Beatles were playing.
 Starr proposed marriage at the Ad-Lib Club in London, on 20 January 1965.
 They married at the Caxton Hall Register Office, London, in 1965, and divorced in 1975.
The Cavern Club at 10 Mathew Street, in Liverpool was the venue where the Beatles' (formerly known as the Quarrymen) UK popularity started.
 John Lennon, Paul McCartney, George Harrison and Pete Best were first seen by Brian Epstein at the club.
 Epstein eventually became their manager, going on to secure them a record contract.
 Best was replaced by Ringo Starr on 16 August 1962, which upset many Beatles fans.
 After taunts of, "Pete forever, Ringo never!"
, one agitated fan headbutted Harrison in the club.
Goodnight Vienna is the fourth studio album by Ringo Starr.
 It was recorded in the summer of 1974 in Los Angeles, and released later that year.
 "Goodnight Vienna" followed the commercially successful predecessor "Ringo", and Starr used many of the same players, including Billy Preston, Klaus Voormann, Robbie Robertson, Harry Nilsson, and producer Richard Perry.
 The title is a Liverpool slang phrase meaning "it's all over".
"Liverpool 8" is a song by Ringo Starr and is the lead track on his 2008 album of the same name.
 The song was also released in early December 2007 as a download-single.
 It was later released in physical formats (7" single and CD single) on 7 January 2008, a week before the release of the album.
 The B-side for the 7" is the third track from the album, "For Love".
 Despite the physical single being available for only 99 pence in the UK, it only reached number 99 there.
 It is an autobiography of Starr put to song, with emphasis on his time with The Beatles.
 The title refers to the postal district of the Toxteth area of Liverpool in which Starr was born.
 The single was produced by Mark Hudson and Starr, and "overproduced" by Dave Stewart and Starr.
"It Don't Come Easy" is a song by English musician Ringo Starr that was released as a non-album single in April 1971.
 Apart from in North America, where "Beaucoups of Blues" had been a single in October 1970, it was Starr's first single release since the break-up of the Beatles.
 The song was a commercial success, peaking at number 1 in Canada and number 4 in both the US and UK singles charts.
 The recording was produced by Starr's former bandmate George Harrison, who also made an uncredited contribution as a composer.
 Starr performed the song with Harrison at the Concert for Bangladesh in August 1971 and it has remained one of his most popular hits as a solo artist.
Albert Starr (born 1926), is a noted American cardiovascular surgeon and pioneer, inventor of the Starr heart valve, who resides and practices in the Portland, Oregon area.
 Starr is special adviser to OHSU Dean of Medicine Mark Richardson and OHSU President Joseph Robertson (OHSU) at Oregon Health and Science University.
 Albert Starr was born on June 1, 1926, in New York, New York.
 He received his B.A. degree from Columbia College (now Columbia University) in 1946 and his M.D. degree from Columbia College of Physicians and Surgeons in 1949.
 He then went on to do his internship at Johns Hopkins Hospital and his residency in general and thoracic surgery at the Bellevue and Presbyterian Hospitals of Columbia University.
 He was an assistant in surgeon at Columbia University until 1957, when he moved to Oregon—having been enticed, in part, by the Oregon Heart Association's promises to help fund his research and to take him salmon fishing.
 There he worked for the Crippled Children's Division at the University of Oregon Medical School (now the Oregon Health and Science University).
 Starr was an instructor in surgery when he met Lowell Edwards in September 1958.
 Starr has said of this meeting, "He was in his 60s and I was in my 30s, but there was no generation gap between us.
Mark Jeffery Hudson (born August 23, 1951 in Portland, Oregon) is a record producer, musician and songwriter based in both Los Angeles and New York City.
 After first rising to prominence as a performer, songwriter and TV personality in the 1970s as a member of the Hudson Brothers trio, Hudson achieved independent success as record producer and songwriter – working with a broad variety of artists including Cher, Ringo Starr, Aerosmith, Scorpions, Ozzy Osbourne, Hanson, Harry Nilsson, and the Baha Men.