Marialyn is a former school teacher, social worker, Assistant United States Attorney, briefing attorney to judges at the state, federal, trial and appellate levels, corporate counsel, most recently an attorney with Prichard Hawkins McFarland & Young.

The Fourth Court of Appeals is one of the 14 intermediate State Appellate Courts in Texas. It is located in Bexar County and serves a 32-county district, which is bounded by Guadalupe County on the East, Starr County on the South, Val Verde County on the West and Menard County on the North. The seven Justices on the Court sit in panels of three and hear appeals of all civil and criminal cases (with the exception of death penalty cases) from the county and district courts in the 32-county district.