Information:  - The San Francisco Peninsula is a peninsula in the San Francisco Bay Area that separates San Francisco Bay from the Pacific Ocean. On its northern tip is the City and County of San Francisco. Its southern base is in northern Santa Clara County, including the cities of Palo Alto, Mountain View and Los Altos. Most of the Peninsula is occupied by San Mateo County, between San Francisco and Santa Clara counties, and including the cities and towns of Atherton, Belmont, Brisbane, Burlingame, Colma, Daly City, East Palo Alto, El Granada, Foster City, Hillsborough, Half Moon Bay, La Honda, Menlo Park, Millbrae, Pacifica, Portola Valley, Redwood City, San Bruno, San Carlos, San Mateo, South San Francisco, and Woodside.  - Prince of Persia is a video game franchise created by Jordan Mechner, originally developed and published by Brøderbund, then the Learning Company, and currently Ubisoft. The franchise is built around a series of action-adventure games focused on various incarnations of the eponymous prince. The first game in the series was designed by Mechner after the success of his previous game with Brøderbund, "Karateka". The title was successful enough to spawn two sequels: the series has been rebooted twice since its acquisition by Ubisoft, and has been successful enough to warrant a , penned in part by Mechner and released by Walt Disney Pictures in 2010. Since its first remake of the "Prince of Persia", the series has seen eight sequels on more than 10 different gaming platforms, from the Game Boy Advance to the PlayStation 3.  - A combined statistical area (CSA) is composed of adjacent metropolitan (MSA) and micropolitan statistical areas (µSA) in the United States and Puerto Rico that can demonstrate economic or social linkage. The United States Office of Management and Budget defines a CSA as consisting of various combinations of adjacent metropolitan and micropolitan areas with economic ties measured by commuting patterns. These areas that combine retain their own designations as metropolitan or micropolitan statistical areas within the larger combined statistical area.  - Redmond is a city in King County, Washington, United States, located east of Seattle, within the Seattle metropolitan area. The population is 60,560 in 2016, an increase from the 2010 census, up from 45,256 in 2000 census. Redmond is commonly recognized as the home of Microsoft and Nintendo of America. With an annual bike race on city streets and the state's only velodrome, Redmond is also known as the "Bicycle Capital of the Northwest".  - Eugene is a city of the Pacific Northwest located in the U.S. state of Oregon. It is located at the southern end of the Willamette Valley, near the confluence of the McKenzie and Willamette Rivers, about east of the Oregon Coast.  - The Learning Company (TLC) known briefly as Mattel Interactive is an American educational software company, currently owned by Houghton Mifflin Harcourt. It produced a grade-based system of learning software and tools to improve productivity. Products for preschoolers through second graders include "Reader Rabbit", and software for more advanced students include "The ClueFinders". The company is also known for publishing licensed educational titles featuring characters such as Arthur Read, Scooby-Doo and Caillou.  - Compact disc (CD) is a digital optical disc data storage format released in 1982 and co-developed by Philips and Sony. The format was originally developed to store and play only sound recordings but was later adapted for storage of data (CD-ROM). Several other formats were further derived from these, including write-once audio and data storage (CD-R), rewritable media (CD-RW), Video Compact Disc (VCD), Super Video Compact Disc (SVCD), Photo CD, PictureCD, CD-i, and Enhanced Music CD. Audio CD players have been commercially available since October 1982, when the first commercially available CD player was released in Japan.  - The San Francisco Bay is a shallow estuary that drains water from approximately 40% of California. Water from the Sacramento and San Joaquin rivers, and from the Sierra Nevada mountains, passes through the bay to the Pacific Ocean. Specifically, both rivers flow into Suisun Bay, which flows through the Carquinez Strait to meet with the Napa River at the entrance to San Pablo Bay, which connects at its south end to San Francisco Bay. However, the entire group of interconnected bays is often called the "San Francisco Bay".  - Brøderbund Software, Inc. was an American maker of video games, educational software and productivity tools.  Brøderbund is best known for the 8-bit computer game hits "Choplifter", "Lode Runner", "Karateka", and "Prince of Persia" (all of which originated on the Apple II), as well as "The Print Shop"originally for printing signs and banners on dot matrix printersand the "Myst" and "Carmen Sandiego" games. The company was founded in Eugene, Oregon, and moved to San Rafael, California, then later to Novato, California. Brøderbund was purchased by The Learning Company in 1998.  - Choplifter (stylized as Choplifter!) is a 1982 Apple II game developed by Dan Gorlin and published by Brøderbund. It was ported to Atari 5200, Atari 8-bit family, ColecoVision, Commodore 64, Commodore VIC-20, and MSX. Graphically enhanced versions for the Atari 7800 and Atari XEGS were published in 1988 by Atari.  - Northern California, often abbreviated NorCal, is the northern portion of the U.S. state of California. Spanning the state's northernmost 48 counties, in contrast to the 10 counties of Southern California, its main population centers include the San Francisco Bay Area (anchored by the cities of San Francisco, San Jose, and Oakland), the Greater Sacramento area (anchored by the state capital Sacramento), and the Metropolitan Fresno area (anchored by the city of Fresno). Northern California also contains redwood forests, along with the Sierra Nevada including Yosemite Valley and part of Lake Tahoe, Mount Shasta (the second-highest peak in the Cascade Range after Mount Rainier in Washington), and the northern portion of the Central Valley, one of the world's most productive agricultural regions.  - Los Angeles (Spanish for "The Angels"), officially the City of Los Angeles and often known by its initials L.A., is the second-most populous city in the United States (after New York City), the most populous city in California and the county seat of Los Angeles County. Situated in Southern California, Los Angeles is known for its mediterranean climate, ethnic diversity, sprawling metropolis, and as a major center of the American entertainment industry. Los Angeles lies in a large coastal basin surrounded on three sides by mountains reaching up to and over .  - California is the most populous state in the United States and the third most extensive by area. Located on the western (Pacific Ocean) coast of the U.S., California is bordered by the other U.S. states of Oregon, Nevada, and Arizona and shares an international border with the Mexican state of Baja California. The state capital is Sacramento. Los Angeles is California's most populous city, and the country's second largest after New York City. The state also has the nation's most populous county, Los Angeles County, and its largest county by area, San Bernardino County.  - The dot-com bubble (also known as the dot-com boom, the tech bubble, the Internet bubble, the dot-com collapse, and the information technology bubble) was a historic speculative bubble covering roughly 19952001 during which stock markets in industrialized nations saw their equity value rise rapidly from growth in the Internet sector and related fields. While the latter part was a boom and bust cycle, the Internet boom is sometimes meant to refer to the steady commercial growth of the Internet with the advent of the World Wide Web, as exemplified by the first release of the Mosaic web browser in 1993, and continuing through the 1990s.  - The United Nations (UN) is an intergovernmental organization to promote international co-operation. A replacement for the ineffective League of Nations, the organization was established on 24 October 1945 after World War II in order to prevent another such conflict. At its founding, the UN had 51 member states; there are now 193. The headquarters of the United Nations is in Manhattan, New York City, and experiences extraterritoriality. Further main offices are situated in Geneva, Nairobi, and Vienna. The organization is financed by assessed and voluntary contributions from its member states. Its objectives include maintaining international peace and security, promoting human rights, fostering social and economic development, protecting the environment, and providing humanitarian aid in cases of famine, natural disaster, and armed conflict.  - A CD-ROM is a pre-pressed optical compact disc which contains data. The name is an acronym which stands for "Compact Disc Read-Only Memory". Computers can read CD-ROMs, but cannot write to CD-ROMs which are not writable or erasable.  - Houghton Mifflin Harcourt Learning Technology , originally started as Riverdeep Interactive Learning , is a publishing house for educational online and CD - ROM products based in San Francisco , United States and Dublin , Ireland . Founded in 1995 , Riverdeep was principally the creation of the Irish ex-investment banker Barry O'Callaghan . O'Callaghan was Riverdeep 's CEO and controlling shareholder . Riverdeep also acquired the companies Broderbund , The Learning Company and Edmark , and became a distributor for said companies . In October 2002 , Riverdeep became a private entity when their stock price plummeted below $ 2 in NASDAQ . On September 20 , 2004 , Riverdeep moved its Novato office to 100 Pine Street in San Francisco . Houghton Mifflin Harcourt officially became a publicly traded company on November 14 , 2013 , with common shares of stock listed on the NASDAQ exchange .  - The City of New York, often called New York City or simply New York, is the most populous city in the United States. With an estimated 2015 population of 8,550,405 distributed over a land area of just , New York City is also the most densely populated major city in the United States. Located at the southern tip of the state of New York, the city is the center of the New York metropolitan area, one of the most populous urban agglomerations in the world. A global power city, New York City exerts a significant impact upon commerce, finance, media, art, fashion, research, technology, education, and entertainment, its fast pace defining the term "New York minute". Home to the headquarters of the United Nations, New York is an important center for international diplomacy and has been described as the cultural and financial capital of the world.  - Houghton Mifflin Harcourt is an educational and trade publisher in the United States. Headquartered in Boston's Back Bay, it publishes textbooks, instructional technology materials, assessments, reference works, and fiction and non-fiction for both young readers and adults.  - San Diego (Spanish for "Saint Didacus") is a major city in California, United States. It is in San Diego County, on the coast of the Pacific Ocean in Southern California, approximately south of Los Angeles and immediately adjacent to the border with Mexico.  - Edmark Corporation is a publisher of educational print materials and an educational software developer in Redmond, Washington. They developed software for Microsoft Windows and Mac OS in several languages and sold it in over a dozen countries.  - Boston (pronounced ) is the capital and most populous city of the Commonwealth of Massachusetts in the United States. Boston is also the seat of Suffolk County, although the county government was disbanded on July 1, 1999. The city proper covers with an estimated population of 667,137 in 2015, making it the largest city in New England and the 23rd most populous city in the United States. The city is the economic and cultural anchor of a substantially larger metropolitan area known as Greater Boston, a Metropolitan Statistical Area (MSA) home to a census-estimated 4.7 million people in 2014 and ranking as the tenth-largest such area in the country. Alternately, as a Combined Statistical Area (CSA), this wider commuting region is home to some 8.1 million people, making it the sixth-largest as such in the United States.  - Microsoft Windows (or simply Windows) is a metafamily of graphical operating systems developed, marketed, and sold by Microsoft. It consists of several families of operating systems, each of which cater to a certain sector of the computing industry with the OS typically associated with IBM PC compatible architecture. Active Windows families include Windows NT, Windows Embedded and Windows Phone; these may encompass subfamilies, e.g. Windows Embedded Compact (Windows CE) or Windows Server. Defunct Windows families include Windows 9x; Windows 10 Mobile is an active product, unrelated to the defunct family Windows Mobile.  - Barry O'Callaghan (born 1969) is a business executive and financier. Currently he is the Chairman and CEO of Rise Global. He formerly led Riverdeep for a decade, later known as EMPG and HMH. He grew the small educational software company into the largest K-12 publishing company in the American education system through a series of acquisitions that were funded by loans. As a result of cuts in school textbook purchases, excessive debt, and the end of the dot-com bubble, the company was taken over by bondholders in 2011. This almost wiped out the interests of shareholders and O'Callaghan's own fortune. After the fallout, he became CEO and partial owner of the international division, EMPGi.  - San Francisco (SF) (Spanish for Saint Francis) officially the City and County of San Francisco, is the cultural, commercial, and financial center of Northern California. It is the birthplace of the United Nations. Located at the north end of the San Francisco Peninsula, San Francisco is about in area, making it the smallest countyand the only consolidated city-countywithin the state of California. With a density of about 18,451 people per square mile (7,124 people per km), San Francisco is the most densely settled large city (population greater than 200,000) in California and the second-most densely populated major city in the United States after New York City. San Francisco is the fourth-most populous city in California, after Los Angeles, San Diego, and San Jose, and the 13th-most populous city in the United Stateswith a census-estimated 2015 population of 864,816. The city and its surrounding areas are known as the San Francisco Bay Area, and are a part of the larger OMB-designated San Jose-San Francisco-Oakland combined statistical area, the fifth most populous in the nation with an estimated population of 8.7 million.  - Mattel, Inc. is an American multinational toy manufacturing company founded in 1945 with headquarters in El Segundo, California. In 2014, it ranked #403 on the Fortune 500 list. The products and brands it produces include Fisher-Price, Barbie dolls, Monster High dolls, Ever After High dolls, Winx Club dolls, Hot Wheels and Matchbox toys, Masters of the Universe toys, American Girl dolls, board games, and WWE Toys. In the early-1980s, Mattel produced video game systems, under both its own brands and under license from Nintendo. The company has presence in 40 countries and territories and sells products in more than 150 nations. The company operates through three business segments: North America, international, and American Girl. It is the world's largest toy maker in terms of revenue. On January 17, 2017 Mattel's named Google executive Margaret "Margo" Georgiadis as its next CEO.   - Carmen Sandiego is an American media franchise of educational computer games and other media featuring a thieving villain of the same name created by Brøderbund. The franchise's main premise follows the computer user who becomes an agent of the ACME Detective Agency and later attempts to thwart and capture V.I.L.E. ringleader Carmen Sandiego. The franchise originally focused on teaching children geography during the 1980s and the 1990s, but later branched out into history, mathematics, English, and other subjects.  - Novato is a city in northern Marin County, in the North Bay region of the San Francisco Bay Area, in the U.S. state of California. As of the 2010 United States Census, its population was 51,904. Novato is located about northwest of San Rafael and about north of San Francisco on U.S. 101.  - A reference work is a book or periodical (or its electronic equivalent) to which one can refer for information. The information is intended to be found quickly when needed. Reference works are usually "referred" to for particular pieces of information, rather than read beginning to end. The writing style used in these works is informative; the authors avoid use of the first person, and emphasize facts. Many reference works are compiled by a team of contributors whose work is coordinated by one or more editors rather than by an individual author. Indices are commonly provided in many types of reference work. Updated editions are usually published as needed, in some cases annually (e.g. "Whitaker's Almanack", "Who's Who"). Reference works include dictionaries, thesauruses, encyclopedias, almanacs, bibliographies, and catalogs (e.g. catalogs of libraries, museums or the works of individual artists). Many reference works are available in electronic form and can be obtained as application software, CD-ROMs, DVDs, or online through the Internet.  - San Rafael (; "Saint Raphael") is a city and the county seat of Marin County, California, United States. The city is located in the North Bay region of the San Francisco Bay Area. As of the 2010 census the city's population is 57,713.  - The San Francisco Bay Area (referred to locally as the Bay Area) is a populous region surrounding the San Francisco and San Pablo estuaries in Northern California. The region encompasses the major cities and metropolitan areas of San Jose, San Francisco, and Oakland, along with smaller urban and rural areas. The Bay Area's nine counties are Alameda, Contra Costa, Marin, Napa, San Francisco, San Mateo, Santa Clara, Solano, and Sonoma. Home to approximately 7.65 million people, the nine-county Bay Area contains many cities, towns, airports, and associated regional, state, and national parks, connected by a network of roads, highways, railroads, bridges, tunnels and commuter rail. The combined statistical area of the region is the second-largest in California (after the Greater Los Angeles area), the fifth-largest in the United States, and the 43rd-largest urban area in the world.  - Lode Runner is a platform video game first published by Brøderbund in 1983. Unlike later platformers which rely on precision jumping and movement, levels in "Lode Runner" are puzzle-oriented. It is one of the first games to include a level editor, a feature that allows players to create their own levels for the game. This feature bolstered the game's popularity, as magazines such as "Computer Gaming World" held contests to see who could build the best level. Tozai, Inc. currently holds the intellectual property and trademark rights of "Lode Runner".    What is the relationship between 'houghton mifflin harcourt learning technology' and 'boston'?
The answer to this question is:
headquarters location