Under Thompson's leadership, All Saints became one of the most generous parishes in contributing to the Episcopal Diocese of Los Angeles' Mission Share Fund.
Thompson also held leadership roles in the diocese, serving on Diocesan Council, the Commission on Ministry, the Ecclesiastical Court, and the Clergy Sexual Misconduct Task Force.
George Deukmejian—a longtime parishioner at All Saints[5]—appointed Thompson to serve on the California Board of Behavioral Science Examiners, which oversees social worker licensing.
[1] The divide between the Episcopal Church and All Saints grew in 2003 with the election of Gene Robinson, a partnered gay man, as bishop of New Hampshire.
In June 2004, Thompson led a conference of Anglican Communion Network members in southern California seeking alternative primatial oversight.
"[10] In September 2004, Bruno and the Diocese of Los Angeles sued the departing congregations to regain control of the property under the Episcopal Church's Dennis Canon.
As the leader of the western Anglican proto-diocese, he was elected the first bishop of the newly approved diocese at ACNA's inaugural assembly in Bedford, Texas, in 2009.
[13] In the summer of 2013, Thompson experienced health problems, including a concussion and low blood pressure, that resulted in hospitalization.