Jenisch began his political career serving on a number of local boards and commissions including the Bloomingdale Commission and Zoning Appeals Board, Village of Addison Substance Responsibility Commission, and the Village of Addison Police Fire Merit Review Board.[2] In 1997, after managing DuPage County Board member Floyd Sanford's successful campaign to become the Township Supervisor of Bloomingdale Township, Jenisch was appointed to replace Sanford on the DuPage County Board.[1]
When then-State Representative Carole Pankau announced her plans to run for the Illinois Senate, Jenisch opted to run for her open seat in the 45th district.[3] The 45th district included all or parts of Bloomingdale, Roselle, Glendale Heights, Carol Stream, Glen Ellyn, Itasca, Addison, Wheaton, and Winfield.[4]
As a member of the Illinois House of Representatives he served on seven committees: Human Services, Insurance, Financial Institutions, Mass Transit, Revenue, Tourism and Conventions, and the KidCare Subcommittee.[2] In 2006, property tax appeals attorney Franco Coladipietro, with the backing of local Republican organizations, challenged Jenisch in the Republican primary.[5] Coladipietro won with a 6.2% margin of victory.[6]
As of 2020, Jenisch is the managing broker and owner at EXIT Realty Redefined.[7]
