Question: When did The president which assigned Rick Perry as current United States Secretary of Energy assume office? 

Context paragraphs:
Alexander Acosta: Rene Alexander Acosta (born January 16, 1969) is an American attorney, academic, and politician who is the 27th and current United States Secretary of Labor.  A Republican, he was appointed by President George W. Bush to the National Labor Relations Board and later served as Assistant Attorney General for Civil Rights and federal prosecutor for the Southern District of Florida.  On , President Donald Trump nominated Acosta to be United States Secretary of Labor.  Acosta is the first and only Hispanic member of Trump's cabinet so far.  He is the former dean of Florida International University College of Law.

Phil Wilson (Texas politician): Samuel Philip "Phil" Wilson (born October 5, 1967) was the Texas Secretary of State, the state's chief elections officer, from 2007 to 2008.  He was appointed effective July 1, 2007, by Republican Governor Rick Perry.  Wilson was the 106th person to hold the position and the fifth individual to have served since Perry assumed the governorship in December 2000.  On June 11, 2008, Wilson announced his resignation, effective July 6, to "pursue other opportunities."  Wilson became senior vice president for public affairs for Luminant, an electric energy company.

Rick Perry: James Richard "Rick" Perry (born March 4, 1950) is an American author and politician who is the 14th and current United States Secretary of Energy, serving in the Cabinet of Donald Trump.  Prior to his cabinet position, Perry served as the 47th Governor of Texas from December 2000 to January 2015.  A Republican, he was elected Lieutenant Governor of Texas in 1998 and assumed the governorship in December 2000 when then-Governor George W. Bush resigned to become President of the United States.  Perry was the longest-serving Governor in Texas history.

United States Secretary of Energy: The United States Secretary of Energy is the head of the U.S. Department of Energy, a member of the Cabinet of the United States, and fourteenth in the presidential line of succession.  The position was formed on October 1, 1977 with the creation of the Department of Energy when President Jimmy Carter signed the Department of Energy Organization Act.  Originally the post focused on energy production and regulation.  The emphasis soon shifted to developing technology for better and more efficient energy sources as well as energy education.  After the end of the Cold War, the department's attention also turned toward radioactive waste disposal and maintenance of environmental quality.  The current Secretary of Energy is Rick Perry

Rick Perry presidential campaign, 2012: The Rick Perry presidential campaign of 2012 began when Rick Perry, four-term Governor of Texas, announced via a spokesman on August 11, 2011, that he would be running for the 2012 Republican Party nomination for president of the United States.

Anita Thigpen Perry: Mary Anita Thigpen Perry (born May 5, 1952) was the longest-serving First Lady of Texas; being in that role from 2000 to 2015.  She is the wife of former Governor and current United States Secretary of Energy Rick Perry.  As First Lady of Texas, she had been an active advocate for nursing and other health care issues.  The Anita Thigpen Perry Endowment at the University of Texas Health Science Center at San Antonio focuses on nutrition, cardiovascular disease, health education, and early childhood development.  In 2008, the Anita Thigpen Perry School of Nursing at Texas Tech University Health Sciences Center was renamed in her honor.

Cabinet of Donald Trump: This article lists the members of President Donald Trump's Cabinet.  Trump assumed office on January 20, 2017.

Political positions of Rick Perry: Rick Perry is an American politician who served as the 47th Governor of Texas from 2000 to 2015.  He was a candidate for the nomination of the Republican Party for President of the United States in 2012 and 2016, and currently serves as the United States Secretary of Energy.

Wilbur Ross: Wilbur Louis Ross Jr. (born November 28, 1937) is an American investor and government official who is the current United States Secretary of Commerce.  On November 30, 2016, President-elect Donald Trump announced that he would nominate Ross to be United States Secretary of Commerce.  On February 27, 2017, the Senate confirmed Ross as United States Secretary of Commerce by a margin of 72–27.  He was sworn into office on February 28, 2017.

Texas Cavalry Service Medal: The Texas Cavalry Service Medal is a service medal of the Texas National Guard which was created by the Texas Legislature under Senate Bill 955 and signed into law by Governor Rick Perry June 17, 2005.  Senate Bill 955, an amendment to Texas Government Code § 431.134, became effective on September 1, 2005.  The Texas Cavalry Medal is awarded to personnel who served on or after September 11, 2001, in the 124th Cavalry, Texas Army National Guard and who served in a hostile fire zone as designated by the United States Secretary of Defense.  This medal is a one time award and there is no provision for subsequent awards.  The first 182 cavalry troopers eligible for the award completed their tour of duty in Iraq on February 11, 2005.  Carrying the same unit heraldry as the 1st Squadron, 124th Cavalry Regiment, members of the Texas National Guard's Brigade Reconnaissance Troops mobilized for Operation Iraqi Freedom III were also eligible for this award.  The order of precedence for this new award has it falling between the Texas Combat Service Ribbon and the Texas Faithful Service Medal.  The Texas Cavalry Service Medal is no longer awarded.

Supporting paragraphs: Rick Perry Cabinet of Donald Trump
Answer: January 20, 2017.