Romagnolo was hired in January 2020 to take over the women's soccer program, becoming the seventh head coach in program history.

She led the Gaels to a 10-4-4 record this past season, her first, full fall season at Saint Mary's. The win total was SMC's best since 2011 and it was their best winning percentage since 2001. The team received votes in the United Soccer Coaches top 25 for the first time since 2004, registerd the fourth-most shutouts in a season in program history, and had a player score eight or more goals in junior Suzuna Shibukawa for the first time since 2014.

Following the 2021 season, the Gaels had numerous postseason honors, including for the first time in school history, a freshman of the year. Saint Mary's also had a first team all-conference selection in Shibukawa and two honorable mention members in Maya Alcantara and AnnaMaria DiGeronimo.

Alcantara and Shibukawa were also named to the United Soccer Coaches 2021 NCAA Division I Women's All-Western Region Second Team and DiGeronimo was named to the All-Western Region Third Team. The program also had five players earn WCC All-Academic Honrable Mention in Alcantara, Emma Barthel, Emily Jensen, Isabella Santavicca, and Laura Trapero Sanz.

In her first season as head coach of the Gaels, Romagnolo led the team to a 4-3-2 conference record and 4-4-3 overall record. Saint Mary's had an incredible turnaround from the season prior as they posted their first winning WCC record in 16 years and best overall record since 2011. Under Romagnolo's tutelage, freshman Taylor Poland was named WCC Goalkeeper of the Year and became the team's first All-WCC First Team honoree since 2017. Alcantara was also selected to the Second Team, marking the program's most representatives on either team since 2010. 

Romagnolo brings 16 years of collegiate coaching experience with her to Moraga, including head coaching duties at Notre Dame and Dartmouth. Romagnolo is also familiar with West Coast soccer as she's spent time at both Stanford and San Diego as an assistant. 

The University of Washington alum most recently served as head coach for the Fighting Irish from 2014-18 with high levels of success each season. Notre Dame made the NCAA Tournament in all four years of her tenure, including two trips to the Round of 16, and claimed their first-ever ACC Regular Season Championship in 2016 under Romagnolo's tutelage. All told, Romagnolo posted a 51-21-13 record at UND and had a myriad of student-athletes receive honors ranging from Academic All-Americans to National Team and NWSL Draft selections. 

Romagnolo left Notre Dame after her fourth season to spend time with her family and also was a volunteer coach at her alma mater in Seattle. 

Prior to working in South Bend, Romagnolo spent three seasons leading the women's team at Dartmouth. In just her second year with the Big Green, the program posted their second-highest winning percentage ever with a 13-4-0 showing and improved by nine wins from the year prior. Dartmouth produced 16 all-conference players, three all-region selections, and an Ivy League Rookie of the Year in 2012. Off the field, the Big Green had a 100 percent graduation rate, 3.4 team GPA, and had an academic All-American under Romagnolo. 

As an assistant at Stanford, Romagnolo helped the Cardinal reach the Final Four in all three of her seasons, including two National Championship appearances. At San Diego, the Toreros reached the NCAA Tournament in three of her five seasons, and were consistently in the top-50 in the RPI. 

As a player, Romagnolo was a standout at Washington as she was named all-conference all four years, an All-American and Scholar Athlete All-American, as well as helped her team win the Pac-10 Championship in 2000. She graduated in 2001 with a degree in business and played in the professional WUSA league for the San Jose CyberRays until 2003. 

Theresa resides in Orinda with her Husband Alex and daughters Sierra and Giovanna