Who are the Supreme Court justices?

The Supreme Court on Tuesday will begin to hear oral arguments in one of the most contentious national debates – whether a Colorado baker can legally refuse to bake a wedding cake for a same-sex wedding.  

The case, Masterpiece Cakeshop v. Colorado Civil Rights Commission, pits baker Jack Phillips’ First Amendment claims of artistic freedom against the anti-discrimination arguments of the Colorado Civil Rights Commission, and the two men for whom Phillips refused to make a wedding cake in 2012.

This case is the first to come before the Supreme Court since it ruled in 2015 that states could not prevent same-sex couples from marrying.

Here’s a look at who is making all the decisions.  

Chief Justice John Roberts

U.S. Chief Justice John Roberts participates in taking a new family photo with his fellow justices at the Supreme Court building in Washington, D.C., U.S., June 1, 2017.  REUTERS/Jonathan Ernst - RC1E9164F080

Chief Justice John Roberts has been a member of the Supreme Court since 2005.  (Reuters/Jonathan Ernst)

Nominated to the bench in 2005 by former President George W. Bush, John Roberts, 62, graduated from Harvard Law School in 1979, according to his court biography. Prior to joining the Supreme Court, Roberts served on the U.S. Court of Appeals for the District of Columbia, as an associate counsel to former President Ronald Reagan and in the White House Counsel’s Office in the 1980s.

Roberts is considered to be a conservative judge on the bench. However, he has angered some Republicans with certain decisions, particularly concerning ObamaCare.

Associate Justice Samuel A. Alito, Jr.

U.S. Supreme Court Justice Samuel Alito participates in taking a new family photo with his fellow justices at the Supreme Court building in Washington, D.C., U.S., June 1, 2017. REUTERS/Jonathan Ernst - RC15DA3386A0

Justice Samuel Alito, Jr. was nominated to the Supreme Court by former President George W. Bush.  (Reuters/Jonathan Ernst)

Samuel Alito, Jr., has served on the Supreme Court since 2006 after he was nominated by former President George W. Bush. Alito, 67, is a Republican.

Born in New Jersey, Alito attended Princeton University and Yale Law School. Before joining the Supreme Court, he was a former assistant to the Solicitor General and worked with the Department of Justice.

Associate Justice Stephen Breyer

U.S. Supreme Court Justice Stephen Breyer participates in taking a new family photo with his fellow justices at the Supreme Court building in Washington, D.C., U.S., June 1, 2017. REUTERS/Jonathan Ernst - RC1D9F7ED140

Justice Stephen Breyer was appointed to the Supreme Court in 1994.  (Reuters/Jonathan Ernst)

Stephen Breyer was appointed to the Supreme Court in 1994 after being nominated by former President Bill Clinton. Breyer, 79, graduated from Stanford University, Magdalen College in Oxford and Harvard Law School.

Previously, Breyer served as an assistant special prosecutor for the Watergate Special Prosecution Force and special counsel of the Senate Judiciary Committee. Breyer is a Democrat.

Associate Justice Ruth Bader Ginsburg

U.S. Supreme Court Justice Ruth Bader Ginsburg participates in taking a new family photo with her fellow justices at the Supreme Court building in Washington, D.C., U.S., June 1, 2017. REUTERS/Jonathan Ernst     TPX IMAGES OF THE DAY - RC11FB606790

Justice Ruth Bader Ginsburg is only the second woman to sit on the Supreme Court.  (Reuters/Jonathan Ernst)

Nominated by former President Bill Clinton in 1993, Ruth Bader Ginsburg is only the second female to be appointed to the Supreme Court. Ginsburg, 84, attended Cornell University for her undergraduate degree before attending Harvard Law School and Columbia Law School.

A Democrat, Ginsburg launched the Women’s Rights Project of the American Civil Liberties Union prior to becoming a Supreme Court justice, according to her court biography. She also served on the ACLU’s general counsel.

Associate Justice Neil Gorsuch

U.S. Supreme Court Justice Neil Gorsuch participates in taking a new family photo with his fellow justices at the Supreme Court building in Washington, D.C., U.S., June 1, 2017. REUTERS/Jonathan Ernst - RC199201ECD0

Justice Neil Gorsuch joined the Supreme Court in 2017. He is its newest member.  (Reuters/Jonathan Ernst)

Neil Gorsuch was President Trump’s first Supreme Court nominee. He graduated from Columbia University, Harvard Law School and Oxford University.

Prior to joining the Supreme Court in 2017, Gorsuch clerked for Justices Byron White and Anthony Kennedy. Gorsuch, 50, served on the Standing Committee on Rules for Practice and Procedure of the U.S. Judicial Conference. He is a Republican.

Associate Justice Elena Kagan

U.S. Supreme Court Justice Elena Kagan participates in taking a new family photo with her fellow justices at the Supreme Court building in Washington, D.C., U.S., June 1, 2017. REUTERS/Jonathan Ernst - RC17E9C01E10

Justice Elena Kagan joined the Supreme Court in 2010 after being nominated by former President Barack Obama.  (Reuters/Jonathan Ernst)

Elena Kagan. 57, has served on the Supreme Court since 2010. She was nominated by former President Barack Obama.

Kagan has degrees from Princeton University, Oxford University and Harvard Law School. She previously was a law professor at the University of Chicago Law School and Harvard Law School. A Democrat, she also served in the Clinton administration, clerked for former Supreme Court Justice Thurgood Marshall and served as the Dean of Harvard Law School.

Associate Justice Anthony Kennedy

U.S. Associate Supreme Court Justice Anthony Kennedy participates in taking a new family photo with fellow justices at the Supreme Court building in Washington, U.S., June 1, 2017. REUTERS/Jonathan Ernst - RC1678921340

Justice Anthony Kennedy has been a member of the Supreme Court longer than any of his current fellow justices. He joined in 1988.  (Reuters/Anthony Kennedy)

Anthony Kennedy, 81, was nominated to the Supreme Court in 1987 by former President Ronald Reagan and was sworn in the next year. He has received degrees from Stanford University, the London School of Economics and Harvard Law School.

A Republican, Kennedy is considered by many to be a swing vote on the court. He’s been a Supreme Court justice longer than any current member.

Associate Justice Sonia Sotomayor

U.S. Supreme Court Justice Sonia Sotomayor participates in taking a new family photo with her fellow justices at the Supreme Court building in Washington, D.C., U.S., June 1, 2017. REUTERS/Jonathan Ernst - RC12A0609960

Justice Sonia Sotomayor was nominated to the Supreme Court by former President Barack Obama in 2009.  (Reuters/Jonathan Ernst)

Sonia Sotomayor received Princeton University’s highest academic honor when she graduated and now she sits on the nation’s highest court. Sotomayor, 63, was nominated by former President Barack Obama in 2009.

Like Alito, Sotomayor also attended Yale University where she got her J.D. Sotomayor, a Democrat, was also appointed to the U.S. District Court, Southern District of New York by former President George H.W. Bush in 1991.

Associate Justice Clarence Thomas

U.S. Supreme Court Justice Clarence Thomas participates in taking a new family photo with his fellow justices at the Supreme Court building in Washington, D.C., U.S., June 1, 2017. REUTERS/Jonathan Ernst - RC15CF6608B0

Justice Clarence Thomas has been on the Supreme Court since 1991.  (Reuters/Jonathan Ernst)

From Pin Point, Ga., Clarence Thomas replaced Thurgood Marshall on the Supreme Court in 1991. He was appointed by former President George H.W. Bush.

Thomas, 69, attended seminary school from 1967 to 1968 before graduating from Holy Cross College and Yale Law School, according to his court biography. A Republican, Thomas has also served as an Assistant Secretary for Civil Rights and the chairman of the U.S. Equal Employment Opportunity Commission.

The Associated Press contributed to this report.

Kaitlyn Schallhorn is a Reporter for Fox News. Follow her on Twitter @K_Schallhorn.