Although sexual orientation and gender identity have no relationship to workplace performance, during the past four decades a large body of research using a variety of methodologies has consistently documented high levels of discrimination against lesbians, gay men, bisexuals and transgendered (LGBT) people at work. Evidence of discrimination has been reviewed and summarized in two recent reports by the Williams Institute at UCLA School of Law: a 2009 report focused on discrimination in the public sector and a 2007 report focused on employment discrimination in the private sector . This review excerpts key findings from those reports and updates those findings with results from recent studies. In addition, it presents for the first time, data documenting discrimination against LGB employees from the 2008 General Social Survey (GSS), a national probability survey representative of the U.S. population. The GSS data show that over one in four LGBT employees report discriminatory treatment in the workplace in past the five years, and over one-third are not out to anyone at work.