Question: Whom owned more art galleries, Larry Gagosian or John Dolmayan?

Context articles: Piran Coastal Galleries
Nathaniel L. McCready House
John Dolmayan
Ontario Association of Art Galleries
George Washington University Art Galleries
Larry Gagosian
Shon McCarthy
Gagosian Gallery
Bust of a Woman (Marie-Thérèse)
Earl L. Stendahl

Piran Coastal Galleries (Slovene: "Obalne galerije Piran" , Italian: "Gallerie Costiere Pirano" ) is a public institution, encompassing a group of six contemporary art galleries.
 Three galleries are located in Piran, two of them in Koper, and one in Venice.
 The institution is the center of contemporary art in Slovenian Littoral, one of the four most influential art galleries in Slovenia, and the only one having an outpost abroad, in Venice.
 They present Slovenian as well as international contemporary artists, keep a rich art museum collection, publish art books and catalogues of exhibitions, and manage a library of modern art.
 The institution produces over one third of the countries entire gallery program.
The Nathaniel L. McCready House, also known as the Harkness Mansion, is a mansion at 4 East 75th Street on the Upper East Side of New York City.
 Completed in 1896 for Nathaniel L’Hommediue McCready, Jr., during the twentieth century it was occupied by Thomas J. Watson, Rebekah Harkness, whose name became associated with the building when she used it as the offices of the Harkness Ballet.
 In 2011, the home was purchased by Larry Gagosian, who demolished the mansion's interior.
John Hovig Dolmayan (Armenian: Ջոն Դոլմայան , born July 15, 1973) is a Lebanese-born Armenian–American songwriter and drummer.
 He is best known as the drummer of System of a Down.
 Dolmayan is also the drummer for the band Indicator and former drummer for Scars on Broadway.
 His energetic live performances with System Of A Down over the years, have garnered him critical acclaim.
 Loudwire listed him as one of the "Top 50 Hard Rock + Metal Drummers Of All Time" , with Dolmayan being ranked at #22.
The Ontario Association of Art Galleries (OAAG) was established in 1968 to encourage development of public art galleries, art museums, community galleries and related visual arts organizations in Ontario, Canada.
 It was incorporated in Ontario in 1970, and registered as a charitable organization.
 The OAAG is a successor organization to the Southern Ontario Gallery Group founded in 1947, renamed the Art Institute of Ontario in 1952.
 The OAAG runs courses and workshops and provides assistance to art galleries in areas such as conservation and arranging exhibitions.
 Most member galleries participate in a reciprocal admissions program, where membership of one gallery gives admission to the others.
 The organization provides a liaison between galleries and the Ontario Arts Council.
The George Washington University Art Galleries, the Luther W. Brady Art Gallery and the Dimock Gallery, are two university-owned and operated art galleries that showcase the University's permanent art collections, as well as visiting exhibitions.
 In addition, The George Washington University has a myriad of galleries showcasing student work throughout its buildings and academic/support facilities.
 Collections include painting, sculpture, and photographs, ranging from rare historic pieces to Washingtonia and Americana to modern art.
Lawrence Gilbert "Larry" Gagosian (born April 19, 1945) is an Armenian American art dealer who owns the Gagosian Gallery chain of art galleries.
 Working in concert with collectors including Douglas S. Cramer, Eli Broad and Keith Barish he developed a reputation for staging museum quality exhibitions.
Shon McCarthy is the Director/Curator of three Jackson State University art galleries.
 The galleries are JSU's Johnson Hall gallery, College of Liberal Arts gallery, and JSU Downtown galleries.
 Exhibitions are student centered and assist to "Exposure+Experience=Lifelong Learning"(gallery mission) for student by including student work with the international and national artists' exhibitions.
 Exhibitions have ranged from painting created by musician George Clinton.
 JSU was the first university to exhibit his paintings.
 In September 2016, McCarthy collaborated with the Philadelphia Museum of Art and procured a gifted 25 piece permanent collection of Patrick Kelly (thanks to a donation from Bill and Bjorn Amelan).
 Spring of 2017, she collaborated with London's Belgravia Art Gallery to bring art created and signed by Nelson Mandela.
 McCarthy created JSU's Gallery1 Summer Art Institute and where JSU Department of Art Alumni taught art to 150 K-9 students.
 For two summers, she supervised and instructed art to over 200 K-9 students this included mulit-medium art to sewing instruction.
 McCarthy later procured an additional 250 plus pieces from the Patrick Kelly collection in the summer of 2017, it is housed the H.T. Sampson Archives.
Gagosian Gallery is a contemporary art gallery owned and directed by Larry Gagosian.
 There are sixteen gallery spaces: five in New York; three in London; two in Paris; one each in Beverly Hills, San Francisco, Rome, Athens, Geneva and Hong Kong.
Bust of a Woman (Marie-Thérèse) is a 1931 sculpture by the Spanish artist Pablo Picasso that depicts Marie-Thérèse Walter, who was Picasso's mistress at the time of its creation.
 In 2016 the ownership of the sculpture was the subject of a legal dispute between the State of Qatar and the American art dealer Larry Gagosian, who had resold the bust to Leon Black.
Earl L. Stendahl (born Earl Leopold Steendahl; December 11, 1888 - May 18, 1966) was a pioneering American art dealer known for promoting California Impressionism, modern and pre-Columbian art.
 He created one of the world's most influential art galleries that celebrated its centennial, still operated by his family, in 2011.
 The Stendahl Gallery is one of America's oldest (if not THE oldest) continuously operating private art galleries.