George Sheridan is a left-of-center labor union activist and member of the executive committee of the National Education Association (NEA), the largest labor union in the United States. Sheridan formerly worked as a United Farm Workers activist, a K-12 schoolteacher in the Black Oak Mine Unified School District of El Dorado County, California and as a course instructor at California State University, Sacramento and the University of California, Davis.
In the 1960s, while in his teens, Sheridan participated in marches supporting the Voting Rights Act, which was signed into law in 1965. Later, Sheridan was an organizer and national boycott coordinator for the United Farm Workers for eight years. During this period, he received training from labor activist Fred Ross Sr., founder of the Community Service Organization, and began working as a K-12 teacher in the Black Oak Mine Unified School District of El Dorado County, California. Sheridan later became the president of the Black Oak Mine Teachers Association, a local-level labor union. Sheridan has also taught graduate courses at California State University, Sacramento and the University of California, Davis. 
National Education Association
In July 2014, Sheridan was elected to the NEA Executive Committee for a three-year term and was reelected to that position in July 2017. The committee is comprised of nine members, three of whom are executive officers like Sheridan, and six of whom are elected by the NEA Representative Assembly. Generally, the committee is responsible for the Association’s policy and activities in the place of its board of directors between the board’s quarterly meetings. 
The NEA is American largest labor union, representing roughly three million active and retired teachers with affiliate groups in every state.  Along with its associated political action committees, the NEA contributed roughly $143.5 million to federal candidates for political office and other political action committees between 1990 and February of 2019. The NEA also regularly supports a variety of left-of-center nonprofits.  The NEA also engages in advocacy campaigns opposing school vouchers and charter schools and supporting increased government involvement in education, especially through Common Core Standards. 
On April 30, 2019, Sheridan addressed the Utah Education Association House of Delegates, encouraging its members to develop initiatives to address purported systemic racial injustice within the education system. Sheridan alleged that the American education system was filled with “white privilege,” and “white supremacy culture.” In his address, Sheridan noted that public school funding is typically based on local property taxes and that therefore “inevitably…students from wealthy white families are far more likely to have great public schools than students from black and brown families,” implying that income disparities which purportedly affect education quality often contain racial basis. 
On July 16, 2019, the NEA published a short video on its YouTube channel, highlighting Sheridan and discussing his work with the organization while encouraging others to become involved.