Question: Boomerang specializes in classic and contemporary animated programming, including an American animated cartoon franchise that was created for Hanna-Barbera Productions by writers Joe Ruby and who else?

Context paragraphs:
Scooby-Doo: Scooby-Doo is an American animated cartoon franchise, comprising several animated television series produced from 1969 to the present day.  The original series, "Scooby-Doo, Where Are You! ", was created for Hanna-Barbera Productions by writers Joe Ruby and Ken Spears in 1969.  This Saturday-morning cartoon series featured four teenagers—Fred Jones, Daphne Blake, Velma Dinkley, and Norville "Shaggy" Rogers—and their talking brown Great Dane named Scooby-Doo, who solve mysteries involving supposedly supernatural creatures through a series of antics and missteps.

Boomerang (Australia and New Zealand): Boomerang is a cable and satellite television channel owned by Turner Broadcasting System, a unit of Time Warner and its main flagship channel of Cartoon Network.  The Australian version of Boomerang was launched on 14 March 2004 as part of the Foxtel Digital launch, with a line-up very similar to that of the US and UK version.  Originally devoted to classic animation from studios such as Hanna-Barbera, the channel has since expanded to include more contemporary programming.  This channel is available as a free trial in a subscription entertainment package on Fetch TV by some ISPs and was added 26 January 2017.  The free trial for Boomerang and Cartoon Network ended 27 February 2017.  After the free trial ended, Boomerang relaunched on Fetch TV, removing the free trial status.

HBTV: HBTV (Hanna-Barbera Television) is a series of animated music videos created by Hanna-Barbera Productions in 1985–1986 featuring clips from various Hanna-Barbera cartoon shows.  The animated videos were similar to Walt Disney Productions' "D-TV" and Nickelodeon's sister network MTV and were originally broadcast as interstitials between segments of the syndicated programming block "The Funtastic World of Hanna-Barbera".

Boomerang (TV channel): Boomerang is an American digital cable and satellite television network that is owned by The Cartoon Network, Inc., a subsidiary of Turner Broadcasting System, itself being a subsidiary of Time Warner.  It specializes in classic and contemporary animated programming from Time Warner's archival history, including "Looney Tunes", "Tom and Jerry", and "Scooby-Doo", along with repeats of in-production series on its sister and another Turner-owned channel, Cartoon Network including "Sonic Boom" and "The Powerpuff Girls".

The Kwicky Koala Show: The Kwicky Koala Show is a 30-minute Saturday morning cartoon produced by Hanna-Barbera Productions that aired on CBS from September 12, 1981 to September 11, 1982.  This series is notable for being among cartoon director Tex Avery's final works; he died during production in 1980.  As it was produced in Australia, the Cartoon Network and later Boomerang broadcasts were sourced from PAL masters, rather than NTSC masters like many other Hanna-Barbera productions.  Each segment has also been shown separately as filler between shows on Boomerang.

The Hanna-Barbera New Cartoon Series: The Hanna-Barbera New Cartoon Series, a.k.a.  The New Hanna-Barbera Cartoon Series or The Wally Gator Show, was a syndicated television package of animated cartoon series produced by Hanna-Barbera Productions, starting in 1962.  The series included three unrelated short cartoon segments featuring funny animal characters:

Ruby-Spears: Ruby-Spears Productions (also known as Ruby-Spears Enterprises) was a Burbank, California-based American entertainment production company that specialized in animation; with another branch in Rome, Italy.  The firm was founded in 1977 by veteran writers Joe Ruby and Ken Spears.

Captain Caveman and the Teen Angels: Captain Caveman and the Teen Angels is an American animated mystery comedy series created by Joe Ruby and Ken Spears and produced by Hanna-Barbera Productions for ABC.  The series aired during the network's Saturday morning schedule from September 10, 1977 to June 21, 1980.

Sealab 2020: Sealab 2020 is a cartoon series produced by Hanna-Barbera Productions and broadcast on NBC from September 9, 1972, to December 2, 1972, on Saturday mornings.  A total of 13 episodes were aired, with two episodes remaining unaired.  As with most Hanna-Barbera series, the show was in occasional rotation on Boomerang, the TV channel that owns the Hanna-Barbera archives.  From 2000 to 2005, the series had a second life when it was parodied as "Sealab 2021" on Cartoon Network's Adult Swim.

Inch High, Private Eye: Inch High Private Eye is a 30-minute Saturday morning animated series produced by Hanna-Barbera Productions and broadcast on NBC from September 8, 1973, to August 31, 1974.  Since the 1980s it has received a resurgence on cable television in the US, in repeats on "USA Cartoon Express", Cartoon Network (as part of the "Mysteries, Inc." block) and Boomerang.  Like many animated series created by Hanna-Barbera in the 1970s, the show contained a laugh track created by the studio.

Supporting paragraphs: Boomerang (TV channel) Scooby-Doo
Answer: Ken Spears