An American software entrepreneur and philanthropist, Tim Gill started the Denver, Colorado-based Gill Action Fund in 2005.

Gill Action is a 501(c)(4) issue advocacy organization dedicated to securing equal rights for all people regardless of sexual orientation and gender expression.  

Tim is also the founder of the Gill Foundation, a 501(c)(3) private foundation dedicated to advancing equality by supporting nonprofit organizations that serve lesbian, gay, bisexual, transgender, and allied individuals, as well as people with HIV/AIDS.  Established in 1994, the foundation has invested more than $110 million in nonprofit organizations throughout the country.

Tim has always been an advocate for civil rights. In addition to funding the gay and lesbian movement for equal rights, he is also a strong supporter of social justice organizations and educational institutions. Tim was one of the first major contributors to the Colorado AIDS Project and has long supported local public radio and television through program underwriting.  Through the Gay & Lesbian Fund for Colorado, a project of the Gill Foundation, Tim has provided financial support to numerous organizations which serve the general public, including nearly $1 million to the American Red Cross for Hurricane Katrina disaster relief.

Tim is founder and former chairman of Quark, Incorporated.  He is recognized for revolutionizing the publishing industry with innovative, affordable, page-layout software. Tim founded Quark, Inc. in 1981 with a $2,000 loan from his parents and worked to build Quark, Inc. into a leading developer of page-layout software.