In 1995, Döring became an active member of the PAN, and he was a citizen councilor from 1995 to 1999 for the borough of Benito Juárez. From 1997 to 2000, he was the technical secretary of the ALDF's Tourism Commission; during this time, he advised the PAN parliamentary group on political reforms in the Federal District. He also has received three diplomas. In 1995, he received a diploma in Mexican Economy: Analysis and Planning from the Chamber of Deputies; he also has two diplomas from Harvard University. From 2000 to 2003, Döring served in the II Legislature of the Legislative Assembly of the Federal District. He presided over the Commission of Local Public Administration, served as Secretary of the Budget and Public Accounts Commission, and sat on commissions dealing with tourism and accounting. From 2003 to 2006, Döring represented Mexico City's 15th district in the Chamber of Deputies during the LIX Legislature. In his first tour of duty in San Lázaro, he was the secretary of two commissions: Communications, and an investigative committee to review public works contracts awarded to Construcciones Prácticas, S.A. de C.V. He also sat on commissions dealing with the Federal District, Budget and Public Accounts, and Special for Investigation of the Institute for the Protection of Bank Savings. While in the LIX Legislature, Döring sat on the Regional Directive Committee for the PAN in the Federal District. In the general election of 2 July 2006, he was elected to the Senate for the PAN, representing the Federal District. In the LX and LXI Legislatures, he was the secretary of the Federal District Commissions and sat on those dealing with Finances and Public Credit; Radio, Television and Film; and Public Security. During this time, he also participated in a political communication seminar at George Washington University. After his six years in the Senate, Döring returned to the Legislative Assembly of the Federal District, serving in its VI Legislature. He headed up the PAN parliamentary group and sat on five committees, including Science and Technology, Budget and Public Accounts, International Matters, Special Commission on Prisons, and Special Commission for the Political Reform of the Federal District. During his time in the Senate, Döring presented a bill that attempted to regulate Internet content, which drew comparisons to the Stop Online Piracy Act in the United States. Voters in the 15thfederal district returned Döring to the Chamber of Deputies in 2015. He serves on commissions both from the Permanent Commission and from the Chamber of Deputies, as well as those dealing with public safety, urban development, and finances and public credit.
