Tim Gill is a software developer and major Colorado Democratic political donor. In business, he is best known for creating Quark, Inc. a privately held corporation most commonly associated with its page layout software and used to develop flyers, websites, graphics, and illustrations.  In 1999, Tim Gill sold 50 percent of his share in Quark to Quark’s co-owner, Ebrahim Rahimi, who bought a 50 percent stake in Quark from Gill in 1986. 
Gill has devoted significant resources to pro-LGBT and left-of-center politics since at least 1994, and is often referred to as a “megadonor” in Democratic circles.  Andy Kroll of Rolling Stone has referred to him as “the nation’s most powerful force for LGBTQ rights.”  His Gill Foundation contributes tens of millions of dollars annually, largely to left-of-center and LGBT-interest advocacy.
Gill (who is gay) increased his political and LGBT-interests advocacy after the passage of Colorado’s 1992 Initiative 2, which would have prohibited municipalities from enacting ordinances adding sexual orientation as a protected status under anti-discrimination laws. 
Many cases expanding LGBT rights, including Goodridge v. Dept. of Public Health case (which made Massachusetts the first state to recognize same-sex marriage) to the Supreme Court’s Obergefell v. Hodges decision were supported by Tim Gill. 
Over the course of the past 25 years the Gill Foundation has contributed more than $360 million to pro-LGBT causes. 
Gill was one of the “Gang of Four” liberal mega-donors, alongside now-Gov. Jared Polis (D), medical device heiress Pat Stryker, and millionaire geophysicist Rutt Bridges, who formed the Colorado Democracy Alliance project to build liberal advocacy infrastructure and support left-progressive political candidates in the state. The right-leaning Washington Free Beacon characterized Gill as a “dark money master” for his work with the Colorado Democracy Alliance. 
In down-ballot 2020 races, Gill has contributed $10,000 to the Iowa Democratic Party, as well as $2,800 through the pro-Democratic ActBlue PAC to the U.S. Senate campaign of former Colorado Gov. John Hickenlooper (D-CO). 
Gill’s husband, Scott Miller, was a consultant for the Joe Biden’s 2020 presidential campaign.  Miller had left the pro-Hillary Clinton PAC “Correct the Record” in 2016 in order to push for Biden to run in the 2016 presidential race.