Question: Steve Haworth did body modification on Dennis Avner, who underwent how many surgeries? 

Context paragraphs:
Modern Primitives (book): Modern Primitives, written by V. Vale and Andrea Juno, is a RE/Search publications book about body modification, published in 1989.  The book consists of a collection of twenty two interviews and two essays with individuals and key figures involved the field of body modification in the late 1980s.  It was one of the first documents to attempt to comprehensively cover the re-emergence and increasing popularity of tattooing, piercing, scarification, corsetry, sideshow, ritual and other practices in contemporary Western Society.

Body Play: Body Play and Modern Primitives Quarterly was a magazine founded in 1992 and published by Fakir Musafar.  It contained information, commentary and interviews pertaining to advanced topics in body modification such as human branding, suspension (body modification), contortionism and binding.  The magazine was not limited to technical information and images but also contained historical information about the development of modern piercing culture, such as the origins of the daith piercing.

Subdermal implant: A subdermal implant refers to a body modification that is placed underneath the skin, therefore allowing the body to heal over the implant and creating a raised design.  Such implants fall under the broad category of body modification.  Many subdermal implants are made out of silicone, either carved or mold injected.  Many people who have subdermal implants use them in conjunction with other types of body modification to create a desired, dramatic effect.  This process is also known as a "3-D implant", or "pocketing".

Implant (body modification): In body modification, an implant is a device is placed under the human skin for decorative purposes.  Such implants may be subdermal or transdermal.  In the context of body modification, some may consider injections of silicone and other substances a type of implant as well.

Stalking Cat: Stalking Cat (born Dennis Avner; August 27, 1958 – November 5, 2012) was an American man known for his extensive body modifications, which were intended to increase his resemblance to a tigress.  For his 14 surgical procedures towards that goal, he held a world record for "most permanent transformations to look like an animal."  The name "Stalking Cat" is a Native American name, given to him in childhood by a medicine man of his tribe.

Aztec body modification: Aztec body modification (or body alteration) was practiced by the members of the Aztec Empire in Mesoamerica.  Many times the body modification was used in ritual or ceremonial practices.  It was also a crucial part of movement between major life stages.

Steve Haworth: Steve Haworth is a body modification artist based in Phoenix, Arizona.  He is responsible for the invention and popularization of subdermal and transdermal implants, such as the "Metal Mohawk".  He designed specialized medical instruments called dermal elevators for this process.  He has also done pioneering work with surface bars, ear shaping, tongue splitting, magnetic implants, and artistic branding (using electrosurgical units).  He has worked on individuals noted for their extensive modifications such as The Enigma, Katzen, Stalking Cat, The Lizardman, and biohacker Tim Cannon.  He is listed in the Guinness World Records as "Most Advanced Body Modification Artist", 1999 to present.

Church of Body Modification: The Church of Body Modification is a non-theistic religion with approximately 3,500 members in the United States.  The church practices body modification in order to "strengthen the bond between mind, body, and soul" and to experience the divine.

Tongue splitting: Tongue bifurcation, splitting or forking, is a type of body modification in which the tongue is cut centrally from its tip to as far back as the underside base, forking the end.  As of now, it is a common body alteration for body modification enthusiasts.

BMEzine: Body Modification Ezine ("BME") is an online magazine devoted to body modification, noted for its coverage of the extreme and fringes of body modification and erotic body play.

Supporting paragraphs: Steve Haworth Stalking Cat
Answer: 14