Question: Don Orsillo is the sports commentator play-by-play announcer for the San Diego Padres on Fox Sports San Diego, Orsillo was the television voice of the Boston Red Sox  from 2001 to 2015, on the NESN (New England Sports Network) is an American regional sports cable and satellite television network, that is owned by a joint venture of which organization?
Context: Don Orsillo (born December 16, 1968) is the sports commentator play-by-play announcer for the San Diego Padres on Fox Sports San Diego.  Orsillo was the television voice of the Boston Red Sox on NESN from 2001 to 2015.  He was then hired by the San Diego Padres to replace broadcasting legend Dick Enberg upon his retirement at the end of the 2016 season. Spectrum Sports is a network of regional sports cable television stations serving much of the upstate New York area.  The stations, which are owned and operated by Charter Communications through its acquisition of Time Warner Cable in May 2016, are available in Rochester, Binghamton, Syracuse and Buffalo.  The network broadcasts a variety of local college and minor league sports broadcasts and is the de facto successor to the Buffalo-based Empire Sports Network.  Unlike most regional sports networks, Spectrum Sports is not available on satellite television, nor is it available in areas of upstate that are served by companies other than Charter Spectrum (such as Atlantic Broadband in Cattaraugus County). John W. Claiborne III (born 1939) is a former front-office executive in American Major League Baseball who also was an early president of the New England Sports Network (NESN), a regional cable television network primarily (80 percent) owned by the Boston Red Sox that telecasts Red Sox baseball and Boston Bruins National Hockey League games. Fox Sports San Diego is an American regional sports network that is owned as a joint venture between Fox Cable Networks, a unit of the Fox Entertainment Group division of 21st Century Fox (which owns a controlling 80% stake) and the San Diego Padres (which owns the remaining 20% stake), and operates as an affiliate of Fox Sports Networks. Dave O'Brien (born August 3, 1963) is an American sportscaster who currently works as the lead play-by-play announcer for Boston Red Sox telecasts on the New England Sports Network. Fox Sports Arizona is an American regional sports network that is owned by Fox Cable Networks, a unit of the Fox Entertainment Group division of 21st Century Fox, and operates as an affiliate of Fox Sports Networks.  The channel broadcasts professional, collegiate and high school sports events, with a primary focus on Phoenix area teams.  It is available on most cable providers throughout Arizona; Fox Sports Arizona is also available nationwide on satellite providers DirecTV and Dish Network. Matthew Edward "Matt" Vasgersian (born September 28, 1967) is an American sportscaster and television host.  Vasgersian is currently a play-by-play announcer for Fox Sports' coverage of Major League Baseball, as well as a studio host for the MLB Network.  In the past he has served as an announcer for Fox Sports' National Football League coverage, NBC Sports' coverage of the Olympic Games, and NBC Sports' coverage of the short lived XFL.  He formerly called play-by-play for the Milwaukee Brewers and the San Diego Padres. Fox Sports Sun, formerly Sun Sports and originally Sunshine Network, is an American regional sports network that is owned by Fox Cable Networks, a unit of the Fox Entertainment Group division of 21st Century Fox, and operates as an affiliate of Fox Sports Networks.  The channel broadcasts local coverage of professional, collegiate and sporting events in the state of Florida, with a focus on professional sports teams based in Miami, Tampa and Orlando.  Fox Sports Sun and sister regional sports network Fox Sports Florida are headquartered in Fort Lauderdale, Florida. Theodore "Ted" Leitner (born July 9, 1947) is a former KFMB News 8 (in San Diego) sportscaster and current radio play-by-play announcer for San Diego Padres baseball and San Diego State Aztecs men's basketball and football.  He is also a former host on KFMB radio in San Diego.  Due to a hectic schedule, he left KFMB just three days shy of his 25th anniversary at that station.  He kept his play-by-play job with the San Diego Padres (who left that station around the same time for cross-town rival KOGO) and later XX Sports Radio (he also for a short time tried an afternoon show on XX Sports Radio as well).  His association with the Padres dates back to 1980. NESN (New England Sports Network) is an American regional sports cable and satellite television network that is owned by a joint venture of Fenway Sports Group (which owns a controlling 80% interest, and is the owner of Boston Red Sox and Liverpool Football Club) and Delaware North (which owns the remaining 20% interest in the network, and owns the Boston Bruins and the TD Garden).  Headquartered in Watertown, Massachusetts, the network is primarily carried on cable providers throughout New England (except in Fairfield County, Connecticut, which is part of the greater New York City media market).  NESN is also distributed nationally on satellite providers DirecTV and Dish Network and as NESN National via select cable providers.  NESN is also on PlayStation Vue at the same areas it is broadcast on cable.
Answer: Fenway Sports Group