2018 TGSIF Sustainability and Impact Report Research May 31, 2022 Paul Sanford speaks at 2022 Texas Association of Public Retirement Systems (TEXPERS) Research November 15, 2020 Antigen? Antibody? P.C.R. ? Understand Coronavirus Tests. August 5, 2019 Click to view the 2018 TGSIF Sustainability & Impact Report.