Question: What president pro tempore of the US state senate once spoke as a guest host for the Institute of Education?

Context paragraphs:
William A. Simonton: William A. Simonton was an American politician in the U. S. state of Delaware.  He served as a senator from New Castle County, Delaware from 1923 until 1939.  Simonton, a Republican, was also the senate's President pro tempore in from 1929 until 1955 and 1937 until 1939.  He had also served as the Dean of the State Senate.  During his time as pro tempore of the senate, Simonton was the last one to serve in the Old State House and the first to serve in the new Delaware Legislative Hall.  Simonton was also a prominent trapshooter.

Pennsylvania State Senate: The Pennsylvania State Senate is the upper house of the Pennsylvania General Assembly, the Pennsylvania state legislature.  The State Senate meets in the State Capitol building in Harrisburg.  Senators are elected for four year terms, staggered every two years such that half of the seats are contested at each election.  Even numbered seats and odd numbered seats are contested in separate election years.  The President Pro Tempore of the Senate becomes the Lieutenant Governor of Pennsylvania in the event of the sitting Lieutenant Governor's removal, resignation or death.  In this case the President Pro Tempore and Lieutenant Governor would be the same person.  The Pennsylvania Senate has been meeting since 1791.

Patrick Leahy: Patrick Joseph Leahy (born March 31, 1940) is an American politician and the senior United States Senator from Vermont, since 1975.  A member of the Democratic Party, Leahy served as the President pro tempore of the United States Senate from December 17, 2012, to January 6, 2015.  As President pro tempore, he was third in the presidential line of succession.  He is the most senior senator and took office at 34 years old, younger than any other current senator.  Leahy received the title of President pro tempore emeritus upon the commencement of the 114th Congress.  He is the last remaining member of the Senate to have served prior to the 1976 election of President Jimmy Carter.

Carl Parker (politician): Carl A. Parker (born August 6, 1934) is an American politician.  He served as a Democratic member in the Texas House of Representatives from 1962 to 1977 and in the State Senate from 1977 to 1995.  His tenure of service included time as Speaker Pro Tempore of the House and President Pro Tempore of the State Senate.

Institute For Education: The Institute For Education, known as IFE, is an American nonprofit organization headquartered in Washington, DC.  The organization facilitates bipartisan collaboration by convening and networking high level leaders from the bounds of politics, business, media, academia, and more.  A selection of guests hosted by the Institute include Hillary Rodham Clinton, John McCain, Antonin Scalia, Orrin Hatch, Ruth Bader Ginsburg and Arianna Huffington.

Presidents pro tempore of the Connecticut Senate: The Lieutenant Governor of Connecticut serves as the President of the Connecticut Senate, but only casts a vote if required to break a tie.  In his or her absence, the President Pro Tempore of the Connecticut Senate presides.  The President pro tempore is elected by the majority party caucus followed by confirmation of the entire Senate through a Senate Resolution.  The President pro tempore is the chief leadership position in the Senate.  The Senate majority and minority leaders are elected by their respective party caucuses.

President pro tempore of the United States Senate: The president pro tempore of the United States Senate ( or ), also president pro tem, is the second-highest-ranking official of the United States Senate.  of the United States Constitution provides that the Vice President of the United States is, despite not being a senator, the President of the Senate, and mandates that the Senate must choose a president "pro tempore" to act in the Vice President's absence.  Unlike the vice president, the president pro tempore is an elected member of the Senate, able to speak or vote on any issue.  Selected by the Senate at large, the president pro tempore has enjoyed many privileges and some limited powers.  During the vice president's absence, the president pro tempore is empowered to preside over Senate sessions.  In practice, neither the vice president nor the president pro tempore usually presides; instead, the duty of presiding officer is rotated among junior senators of the majority party to give them experience in parliamentary procedure.

President pro tempore of the Oklahoma Senate: The President "pro tempore" of the Oklahoma Senate is the second-highest-ranking official of the Oklahoma Senate and the highest-ranking state senator.  The Oklahoma Constitution designates the Lieutenant Governor of Oklahoma as the highest-ranking official, serving ex officio as President of the Senate, even though he or she only votes in the case of a tie.  During the lieutenant governor's absence, the president pro tempore presides over sessions.  The lieutenant governor presides over sessions devoted to ceremonial purposes, while the bulk of the management and political power is reserved for the president pro tempore.

Orrin Hatch: Orrin Grant Hatch (born March 22, 1934) is an American attorney, politician, and author who has been the president pro tempore of the United States Senate since January 2015.

Electoral history of Ted Stevens: Electoral history of Ted Stevens, Senior United States Senator from Alaska (1968-2008), Senate Minority Whip (1977-1981), Senate Majority Whip (1981-1985), President pro tempore of the United States Senate (2003-2007) and President pro tempore emeritus (2007-2008)

Supporting paragraphs: Institute For Education Orrin Hatch
Answer: Orrin Hatch