Question: Where is the brokerage firm founded by the author of "The Pursuit of Happyness" headquartered?

Context paragraphs:
EF Hutton: EF Hutton is an American stock brokerage firm founded in 1904 by Edward Francis Hutton and his brother, Franklyn Laws Hutton.  Later, it was led by well known Wall Street trader Gerald M. Loeb.  Under their leadership, EF Hutton became one of the most respected financial firms in the United States and for several decades was the second largest brokerage firm in the country.  The firm was best known for its colorful TV commercials in the 1970s and 1980s based on the phrase, "When E. F. Hutton talks, people listen," which usually involved a young professional remarking at a dinner party that his broker was EF Hutton, which caused the moderately loud party to stop all conversation to listen to him.

Charles Moran (racing driver): Charles Moran Jr. (May 27, 1906 in New York City – June 7, 1978 in Teasdale, Utah) was an American racecar driver and managing partner of Francis I. DuPont, brokerage firm.  He was born in New York City, son of Charles Moran, naval historian, and Martha Adams.  He attended St. George's School in Newport, R.I., and Princeton University.  He graduated from Columbia University.  In 1928, driving a Rallye, he finished 4th in the 24-hour race at Baldoux, the Bol d'Or, driving the full 24 hours without relief.  For the next year and a half he campaigned this car in Spa, San Sebastien, Madrid, Geisberg.  He was the first American to race at LeMans in 1929, in a DuPont, with co-driver Alfredo Luis Miranda; he raced the same car at Indianapolis in 1930 with George Reed in the mechanics seat.  In 1932 he gave up racing, joined DuPont Motors as an engineer, and then moved to a related enterprise, the brokerage firm of Francis I. DuPont, where he became managing partner in the 1950s.  In 1935 he married Josephine Taylor; they had two children, Charles Moran III(1936) and David Taylor Moran(1940).  Charles Moran Jr. served in the O.S.S.in England and France in 1944-5.  In 1949 he resumed racing, this time in sports cars (Bugatti, MGs, Cunninghams, A. C. Bristol, Lotus, Ferrari) in SCCA events and again at Le Mans, with his Ferrari 212 (1951, finishing 16th, 1952 DNF) and with his Cunningham C4Rx coupe, co-driver John Gordon Bennett (1953, finishing 10th).  He became Secretary of the Sports Car Club of America in 1952-3 and President in 1954-5.  He was a member of the Commission International Sportive and the American representative at the Federation Internationale d'Automobile.  He chaired the Board of Trustees at St. George's School 1958-62.

Gardner Rich &amp; Co: Gardner Rich & Co LLC is an FINRA-registered, private stock brokerage firm founded by Chris Gardner in 1987.  The firm is headquartered in Chicago, Illinois, with offices in New York City, and San Francisco.  It is an institutional brokerage firm that specializes in the execution of derivative product transactions, as well as debt and equity for public pension plans, institutions, and large unions.

Benjamin Edwards (stockbroker): Benjamin Franklin Edwards III (October 26, 1931 – April 20, 2009) was a stockbroker who expanded A. G. Edwards, a brokerage firm founded by his great-grandfather, from a regional firm to a nationwide stockbroking powerhouse, building it into the largest American brokerage firm headquartered outside of New York City.  He built what was the world's largest collection of Imari porcelain, a 3,000-piece portion of which was sold at auction for $6 million.

Cogan, Berlind, Weill &amp; Levitt: Cogan, Berlind, Weill & Levitt, originally Carter, Berlind, Potoma & Weill, was an American investment banking and brokerage firm founded in 1960 and acquired by American Express in 1981.  In its two decades as an independent firm, Cogan, Berlind, Weill & Levitt served as a vehicle for the rollup of more than a dozen brokerage and securities firms led by Sanford I. Weill that culminated in the formation of Shearson Loeb Rhoades.

Loeb, Rhoades &amp; Co.: Loeb, Rhoades & Co. was a Wall Street brokerage firm founded in 1931 and acquired in 1979 by Sanford I. Weill's Shearson Hayden Stone.  Although the firm would operate as Shearson Loeb Rhoades for two years, the firm would ultimately be acquired in 1981 by American Express to form Shearson/American Express and three years later Shearson Lehman/American Express.

Interactive Brokers: Interactive Brokers LLC (IB) is a U.S.-based electronic brokerage firm.  It is the largest U.S. electronic brokerage firm by number of daily average revenue trades, and is the leading forex broker.  The company brokers stocks, options, futures, EFPs, futures options, forex, bonds, funds and CFDs. Interactive Brokers also services commodity trading advisors (CTAs), making it the fifth-largest prime broker servicing CTAs.

Chris Gardner: Christopher Paul Gardner (born February 9, 1954) is an American businessman, investor, stockbroker, motivational speaker, author, and philanthropist who, during the early 1980s, struggled with homelessness while raising his toddler son, Christopher Gardner, Jr.  Gardner's book of memoirs, "The Pursuit of Happyness", was published in May 2006.  The 2006 motion picture "The Pursuit of Happyness", directed by Gabriele Muccino and starring Will Smith is based on the book.

Selling away: Selling away in the U.S. securities brokerage industry is the inappropriate practice of an investment professional (such as a registered representative, stockbroker, or financial adviser) who sells, or solicits the sale of, securities not held or offered by the brokerage firm with which he is associated (affiliated).  An example of the term expressed in a sentence is, "The broker was selling investments away from the firm."  Brokers marketing securities must have obtained the appropriate securities licenses for various types of investments.  Brokers in the U.S. may be "associated" with only one Brokerage firm and they obtain such licenses or "series" by passing standardized Financial Industry Regulatory Authority (FINRA) exams such as the Series 6 or Series 7 exam.  See List of Securities Examinations for types of securities licenses in the U.S.

Royal Securities Corporation: Royal Securities Corporation Limited was a stock brokerage firm founded in Halifax, Nova Scotia, Canada in early 1903 by John F. Stairs, its first president.  The company was the first brokerage firm to be opened east of Montreal, Quebec, the then financial center of Canada.

Supporting paragraphs: Gardner Rich &amp; Co Chris Gardner
Answer: Chicago, Illinois