Question: Which President that served as a Senator from California,  did Beatrice Willard serve as an advisor?
Context: The National Security Advisor is a senior aide in the cabinet of the President of Nigeria who serves as the chief advisor to the President on national security issues.  He participates in the meetings of the National Security Council and other deliberations on security matters.  The National Security Advisor is often appointed by the President of Nigeria and serve a tenure not more than 4 years. Siddharth N. "Bobby" Mehta was former CEO and vice chairman of HSBC North America.  Mehta served as an Advisor of TransUnion since December 31, 2012.  Mehta serves as consultant of TransUnion.  He served the chief executive officer and president of TransUnion from August 2007 to December 31, 2012, and Transunion Financing Corp. until December 31, 2012.  From May 2007 to July 2007, he served as a consultant to the board of directors at TransUnion.  He served as the chief executive officer and president of TransUnion until December 31, 2012.  He served as the chief executive officer of TransUnion LLC.  He served as chairman of the board and chief executive officer of HSBC Finance Corporation from April 2005 to February 2007.  He served as chief executive officer and president of TransUnion LLC from 2007 to 2012.  From 1998 to 2007, he held a variety of positions with HSBC Finance Corporation and HSBC North America Holdings, Inc.  Mehta served as chief executive officer of HSBC North America until February 2007.  Mehta served as consultant of TransUnion since May 2007 until July 2007.  Mehta served as group managing director of HSBC Holdings PLC of HSBC Finance Corp. since April 30, 2005, and its unit chief executive officer since March 2005.  He served as the chief executive of HS BC North America Holdings Inc., of HSBC Finance Corp., from March 2005 to February 15, 2007.  He served as an executive chairman of HSBC Financial Corporation Limited since April 2005 and served as its chief executive officer from April 2005 to February 15, 2007.  He served as the chief executive officer of HSBC Bank USA, N.A. until February 2007.  He served as the chief executive officer of HSBC North America Holdings Inc. since March 2005.  He served as chairman and chief executive officer of HSBC Financial Corp., Ltd.  He oversaw HSBC's global credit card services, its North American consumer lending and mortgage services businesses and its first mortgage operation.  He was also responsible for corporate marketing, strategic planning and corporate development for HSBC North America Holdings Inc. and had responsibility for the strategic management of credit cards throughout the HSBC Group.  Mehta served as group executive of Credit Card Services, Auto Finance and Canada of Household International Inc., since July 2002.  He worked at MasterCard’s U.S. region board since March 2000.  Mehta joined Household International Inc., in 1998.  He served as senior vice president of The Boston Consulting Group in Los Angeles and co-leader of Boston Consulting Group Financial Services Practice in the United States.  Mehta served as a director of Global Board of MasterCard Incorporated since March 17, 2005.  He served as unit chairman of HSBC Holdings PLC and served as its board member since March 2005.  He served as vice chairman and director of HSBC Financial Corporation Limited., (Formerly Household International Inc.).  He has been a director of Avant Credit Corporation since December 18, 2014.  He has been an independent director of The Allstate Corporation since February 19, 2014.  He serves as a member of the advisory board at Core2 Group, Inc.  He has been non-executive independent director at Piramal Enterprises Ltd since April 1, 2013.  He serves on the boards of Datacard, Chicago Public Education Fund, University of Chicago Laboratory Schools, The Economic Club of Chicago, The Field Museum and Myelin Repair Foundation.  He serves as a director of TransUnion Corp. and TransUnion LLC.  He served as a director of MasterCard International Inc. (also known as MasterCard Worldwide) (formerly, MasterCard Inc.), since March 17, 2005.  He served as a director of HSBC Financial Corp.  Ltd.  He has been a director of TransUnion since April 2012.  Mehta serves on the board of international advisors for the Monterey, California, Institute of International Studies and is a member of the Financial Services Roundtable.  He also serves on the board of advisors for the Myelin Repair Foundation.  Mehta holds a Bachelor of Arts in economics from the London School of Economics and Masters of Business Administration from the University of Chicago.  He stepped down as head of the North American unit after the lender raised its forecast for bad loans in the U.S.  He is of Indian descent. The Beatrice Willard Alpine Tundra Research Plots were established in 1959 along Trail Ridge Road in Rocky Mountain National Park, Colorado, above the treeline in an alpine tundra habitat.  The plots were used by Beatrice Willard of the Institute of Arctic and Alpine Research at the University of Colorado from 1959 to about 1999 in a long-term study of the alpine ecosystem.  Willard's dissertation and updates, as well as her book "Land Above the Trees: A Guide to American Alpine Tundra" were highly influential in studies of alpine and tundra ecology.  Her recommendations were used by the National Park Service in its management of the high alpine areas of the park.  Willard's work continued after she moved on to other work, and for the last twenty years she made informal visits to the plots. Juan Francisco Lozano Ramírez (born 19 March 1964) is a Colombian lawyer and journalist currently serving as Senator of Colombia and since 2010 has been the General Director of the Social Party of National Unity (Party of the U), Colombia's biggest political and most influential political coalition.  Under the Administration of President Álvaro Uribe Vélez he served as the 3rd Minister of Environment, Housing and Territorial Development (2006-2009), High Presidential Advisor (2004-2006), and Presidential Advisor of Social Policy (2004), and had also served as Presidential Advisor for the Youth, Women, and Family (1990-1993) in the Administration of President César Gaviria Trujillo. Richard Milhous Nixon (January 9, 1913 – April 22, 1994) was the 37th President of the United States from 1969 until 1974, when he resigned from office, the only U.S. president to do so.  He had previously served as the 36th Vice President of the United States from 1953 to 1961, and prior to that as a U.S. Representative and also Senator from California. Beatrice Willard (December 19, 1925 – 7 January 2003) was an American botanist who specialized in studies on the ecology and botany of high alpine tundra, as well as arctic tundra.  Willard's studies influenced public policy with her studies, which centered on plant life at high altitudes.  Willard was responsible for the establishment of the Beatrice Willard Alpine Tundra Research Plots above the treeline in Rocky Mountain National Park, now listed on the National Register of Historic Places.  In later years she was an adviser to U.S. presidents Nixon and Ford as the first woman on the Council on Environmental Quality (CEQ). Nancy Elisabet Soderberg (born 1958) is an American foreign policy strategist.  She served President Bill Clinton as Deputy National Security Advisor and as an Ambassador at the United Nations.  She is currently President and CEO of Soderberg Global Solutions and Director of the Public Service Leadership Program at the University of North Florida in Jacksonville, FL.  She was appointed by President Obama to serve as Chair of the Public Interest Declassification Board (2011-2014).  She has also previously served as President of Connect U.S. Fund, as Vice President of the International Crisis Group, and on the Board of the Jacksonville Port Authority.  She was a senior advisor to Senator Edward M. Kennedy, and worked on four presidential campaigns.  She is a member of the Council on Foreign Relations.  She is a regular commentator on national and international television and radio, having appeared on NBC, ABC, CBS, CNN, BBC, Fox, National Public Radio, the Lehrer News Hour, CNN Crossfire, and The Daily Show.  She is the author of numerous articles on American foreign policy and two books: “The Prosperity Agends” (2008) written with Brian Katulis, and the Superpower Myth (2005).  In 1984, Soderberg received a Master of Science Degree from Georgetown University's School of Foreign Service, concentrating on development economics and political risk analysis.  She received her Bachelor of Arts in 1980 from Vanderbilt University.  It was reported on July 12th, 2017 that Soderberg had filed paperwork to run for Congress in the 2018 Midterm Elections in Florida's 6th Congressional District, as a Democrat . The Senator Hotel (officially Hotel Senator) (1924–1979) was a nine-story, 400-room Italian Renaissance-style hotel in Sacramento, California located at 12th and L streets across from the California State Capitol building that served as a nexus of California political and social activity for more than 50 years.  Opened in 1924, the Senator Hotel was where Arthur Samish, one of the most influential and powerful individual lobbyists in the history of California, maintained a suite during the 1930s and 1940s.  President Gerald Ford spent the night at the Senator Hotel before the September 5, 1975, assassination attempt on him by cultist Manson family disciple Squeaky Fromme.  Although the Senator Hotel was listed on the National Register of Historic Places in May 1979, the hotel was closed two months later and shuttered with panels placed over the windows that same year.  The structure was renovated and then reopened in 1983 as an office building under the name Senator Hotel Office Building, giving lobbyists short-walking-distance access to California's state politicians. The Science Advisor to the President is an individual charged with providing advisory opinions and analysis on science and technology matters to the President of the United States.  The first Science Advisor, Vannevar Bush, chairman of the Office of Scientific Research and Development, served Presidents Franklin Delano Roosevelt and Harry S. Truman from 1941 to 1951.  President Truman created the President's Science Advisory Committee in 1951, establishing the chairman of this committee as the President's Science Advisor.  This committee continued under Presidents Dwight D. Eisenhower, John F. Kennedy, Lyndon B. Johnson, and Richard M. Nixon until 1973.  Nixon terminated the committee rather than appointing a replacement for his advisor who had resigned.  The US Congress established the Office of Science and Technology Policy in 1976, re-establishing Presidential Science Advisors to the present day. Arthur Cutts Willard (1878–1960) was the ninth president of the University of Illinois and an innovator in the field of heating and ventilation.  Known for being approachable, a gentleman and well-dressed; he was known and admired by many.  He received worldwide acclaim for his research and contribution to the heating, ventilating field; in particular for his contributions to the Holland Tunnel.  In addition to his contributions to heating and ventilation industry, Willard was an educator in heating and ventilation and mechanical engineering between 1906 and 1933.  He taught at George Washington University and the University of Illinois.  Willard was appointed president in 1934 and served until 1946.  Although he served as president during a difficult time for the university and the nation, he continued to have the highest expectations of his students.  During his time as president he obtained funding for construction and addition of many buildings on the University of Illinois campuses.  Willard strongly believed education needed to be more broad and focus on the social and economic problems facing the nation.  At the end of service to the University, the Institute of Aviation was established at University of Illinois Willard Airport, and it was named in honor of A.C. Willard.
Answer: Richard Milhous Nixon