In 2012, Tanner was appointed director of prayer mobilization, following in the footsteps of Dick Eastman. Three years later, in 2015, Tanner stepped into the role of international director. In this role, he spearheaded the launch of Every Home’s Oikos initiative, a strategic plan to reach everyone, everywhere, with the gospel within this generation. Tanner was named executive director in 2020 and helped lead the ministry through the COVID-19 pandemic. In September of 2021, at Dick’s recommendation, the board of directors approved Tanner as Dick’s successor, and in September 2022, Tanner formally succeeded Dick as president.