Question: Where is the headquarters for the company for which Gary Kovacs served as CEO?

full_context: Document 1: Norwich Union: Norwich Union was the name of insurance company Aviva's British arm before June 2009. It was originally established in 1797. It was listed on the London Stock Exchange and was once a constituent of the FTSE 100 Index.
Document 2: Gary Kovacs: Gary Kovacs (born 1963 or 1964) is a San Francisco Bay Area technologist. He was the Chief Executive Officer of AVG Technologies. Kovacs has worked for Mozilla Corporation, Adobe, SAP, and IBM, and led Zi Corporation, a mobile text messaging company.
Document 3: George Conrades: George Conrades is chairman and former Chief Executive Officer of Akamai Technologies. Prior to Akamai, Conrades served as CEO of BBN Technologies. Before joining BBN he spent 31 years at IBM, running its U.S. and Asia-Pacific businesses and heading two manufacturing and development groups. In addition to Akamai, Mr. Conrades serves on the Board of Directors of Oracle Corporation, Ironwood Pharmaceuticals and Harley-Davidson.
Document 4: Avaya: Avaya ( ) is an American multinational technology company headquartered in Santa Clara, California which specializes in Internet telephony, wireless data communications and customer relationship management (CRM) software. It serves organizations at over one million customer locations worldwide, with operations divided globally into five regions, and is number 101 on "Forbes"' list of America's largest private companies.
Document 5: Covario: Covario, Inc. was an American search marketing agency and technology firm based in San Diego, California. The company specialized in international search engine marketing services and provided software tools for SEO, paid search, social media marketing, analytics and local search optimization. Its customer base included technology, consumer electronics, financial services, retail, ecommerce, media, entertainment, publishing, and consumer packaged goods organizations. Covario was acquired by the Dentsu Aegis Network in September 2014, and combined with iProspect, the network's performance marketing arm, in early 2015.
Document 6: HCL Technologies: HCL Technologies Limited is an Indian multinational IT services company, headquartered in Noida, Uttar Pradesh, India. It is a subsidiary of HCL Enterprise. Originally a research and development division of HCL, it emerged as an independent company in 1991 when HCL ventured into the software services business. HCL Technologies (the abbreviation of Hindustan Computers Limited) offers services including IT consulting, enterprise transformation, remote infrastructure management, engineering and R&D, and business process outsourcing (BPO). HCL also provides services such as DRYiCE, Cybersecurity and Digital & Analytics.
Document 7: Matomy Media: Matomy Media Group Ltd. (, ) a publicly traded company since July 2014, is an international digital marketing company providing advertisers, agencies, publishers and application developers with a wide range of performance-based and programmatic advertising solutions. The company was incorporated in 2006 and launched in 2007 as AdsMarket. Clients include HSBC, American Express and AT&T. The company was founded by current Matomy CEO Ofer Druker, Adi Orzel and Kfir Moyal, and is headquartered in Tel Aviv, Israel, with additional offices in Madrid, Mexico City, Berlin, Munich, London, Denver, Fort Lauderdale, Fla, New York City and San Francisco. The company employs more than 400 people, has a client base of 2,000-plus active customers and works with more than 26,000 registered media sources in 100 countries. The company has been a part of the IAB QAG Certified Network since 2011.
Document 8: List of mergers and acquisitions by Symantec: Symantec is an American computer software company founded on March 1, 1982. It is an international corporation that specializes in selling security and information management software, and is listed on the NASDAQ-100 stock market index and Fortune 1000 list of the largest American companies. Gary Hendrix founded the company in 1982 with the help of a National Science Foundation grant. Symantec was originally focused on artificial intelligence-related projects, and Hendrix hired several Stanford University natural language processing researchers as the company's first employees. After the company's initial public offering in 1989, Hendrix left the company in 1991 and moved to Texas. The company has acquired 57 companies, purchased stakes in 2 firms, and divested 26 companies, in which parts of the company are sold to another company. Of the companies that Symantec has acquired, 50 were based in the United States. Symantec has not released the financial details for most of these mergers and acquisitions.
Document 9: Yuval Ben-Itzhak: Yuval Ben-Itzhak is an executive and entrepreneur. He received a number of honors and public recognition for his work as a Chief Technology Officer throughout his career. Ben-Itzhak has been selected as the 25 most influencing CTO by Infoworld, 40 Innovative IT People To Watch by Computerworld, and 2017 Chief Technology Officer of the Year by GeekTime. He was the Chief Technology Officer at AVG and was part of the leadership team that took AVG through its initial public offering on the New York Stock Exchange in 2012. He was the Chief Technology Officer at Outbrain until 2017, and now is the Chief Executive Officer at Socialbakers.
Document 10: Steve Scott (computer architect): Steve Scott is a computer architect who currently serves as Senior Vice President and Chief Technology Officer at Cray Inc. Scott was previously a Principal Engineer at Google and the chief technology officer for Nvidia's Tesla business unit. Scott was employed by Cray Research, Inc., Silicon Graphics, Inc., and Cray, Inc. from 1992 - 2011 (with a brief hiatus in 2005).
Document 11: Expert Global Solutions: Founded in 2012, Expert Global Solutions, Inc., ("EGS", formerly NCO Group), based in Plano, Texas, is the world's largest privately owned Business Process Outsourcing company with more than 100 locations globally and more than 40,000 associates. It is a holding company for NCO and APAC Customer Services, Inc. (APAC), providers of global business process outsourcing services. NCO provides accounts receivable management (ARM) services, and APAC provides customer relationship management (CRM) services. EGS has over 100 locations, with more than 42,000 employees. EGS is owned by One Equity Partners (OEP), the private investment arm of JP Morgan Chase & Co.
Document 12: Cygnific B.V.: Cygnific B.V., a pan-European service provider is a subsidiary of KLM Royal Dutch Airlines that was founded in 1998. Cygnific is based in Amsterdam but also has a service centre in Enschede. About 700 employees assist customers and travel agents in a variety of countries and languages. By carrying out reservations, providing general information and supporting the KLM website Cygnific handles every year approximately 3 million transactions.
Document 13: Gary Babcock Gordon: Gary Gordon is a retired engineer, naval officer, associate professor at San Jose State University, Agilent Technologies Fellow, and co-founder of Cambotics, a company pioneering robotic studio camera dollies. He is a named inventor on 79 patents including the modern optical computer mouse. At Hewlett Packard he pioneered instrumentation for testing computer circuits including the first Logic Probe, Logic Clip, Logic Pulser, and HP's first Logic Analyzer. Subsequently he led the development of a number of projects including HP's distance-measuring laser interferometer, the ORCA Robot, and various instruments used in analytical chemistry and bioscience. His research also included computer input devices, and in 1999 he was awarded HP's first annual Prize for Innovation for co-inventing the modern optical computer mouse which measures travel by correlating successive images of the work surface. His philanthropic interests include writing eye tracking software for controlling a screen cursor with ones gaze and the SoftSwitch input device, both for paralyzed computer users, and teaching radio technology at Handiham radio camps. In 2017 the Computer History Museum produced a 45 minute video and transcript chronicling Gordon's career and his contributions to the development of digital computers.
Document 14: David Jevans: David Jevans is the Chairman and founder of IronKey, an Internet security and privacy company in California. He has previously held senior positions at various Internet security companies, primarily Chief Marketing Officer and Senior Vice President positions at Tumbleweed Communications (NASDAQ:TMWD), Valicert (NASDAQ:VLCT), Teros (since acquired by Citrix, NASDAQ: CTXS), and Differential. Prior to moving into the security industry, he served on the CEO's technology council at Apple Computers, and as Vice President of Networking at Catapult Entertainment.
Document 15: AVG Technologies: AVG Technologies is a security software company headquartered in Amsterdam, Netherlands, that was founded in 1991 by Jan Gritzbach and Tomáš Hofer. Since 2016 the company has been a subsidiary of Avast Software. The company developed antivirus software and internet security services such as AVG AntiVirus and has corporate offices in Europe, Israel, Brazil, Canada and the United States.
ground_truth: Amsterdam, Netherlands