During his tenure, Brennan has tutored numerous student-athletes to All-America and conference accolades. Since joining the staff, he has enhanced Stanford's reputation as the country's top women's tennis program by helping guide the Cardinal to a 448-27 overall record, eight national championships and 16 conference titles.
In the short time since Brennan was elevated to associate head coach, Stanford has claimed four individual NCAA titles. The 2012 season was especially historic, as teammates squared off in the singles final before later pairing up in the doubles title match for the first time in NCAA history. Nicole Gibbs defeated Mallory Burdette in the singles final, before the duo paired up one hour later to claim the doubles crown. Thanks to Brennan's efforts, Stanford has now produced the last three NCAA doubles championship teams.
Brennan was honored as the ITA's Northwest Region Assistant Coach of the Year in 2011, helping lead Stanford to a national runner-up finish, a 28-1 overall record and yet another Pac-10 title.
Two years ago, Brennan's contributions were highlighted with Hilary Barte and Lindsay Burdette capturing Stanford's 13th overall collegiate doubles title and first since 2005. Designated in the fall season as the primary coach for Barte and Burdette, Stanford's top duo flourished under Brennan's tutelage, finishing 42-6 overall and winning three doubles titles in addition to the national championship. Furthermore, the lower half of the singles lineup (Nos. 4-6) proved to be an area of strength for Stanford, with the group combining for a 65-11 record while Brennan patrolled the back courts.
In 2005, Brennan was recognized as the ITA Northwest Region Assistant Coach of the Year. In 2003, Brennan's efforts were recognized on a higher level when he was named the ITA National Assistant Coach of the Year.
Brennan, son of legendary former head coach Frank Brennan, Sr., was a two-time all-conference player for the University of Redlands, where he helped the team to a Final Four appearance in 1993 and a fifth-place national finish in 1994. He was also a two-time all-conference honoree at Foothill Junior College, where he helped lead the team to a semifinal appearance in the state championships in 1991 and a runner-up finish in 1992.
In 1991, Brennan was voted as The Times Tribune Athlete of the week twice, named MVP of the tennis team and nominated as The Times Tribune Athlete of the Year. He was also nominated for the Foothill College Male Athlete of the Year.
Brennan was head coach of the women's tennis team at the University of Redlands in 1995 before coming to work for his father in 1996. He has also worked for the United States Tennis Association, assisting in the Area Training Center and serving as a USTA zonal coach. Brennan has also been a hitting partner for Venus Williams and other top professionals at the Bank of the West Classic. Brennan also played a few years on the satellite circuit.
Brennan prepped at St. Francis and Los Altos High schools, where he was a four-year letterwinner in both tennis and football. He finished his senior year on the East Coast at Mt. St. Joseph High School in Vermont, where he was a standout running back on their State Championship football team.
A third generation coach, Brennan and his family have been involved with coaching tennis for years. His grandfather was Billie Jean King's coach for 18 years, as well as the personal instructor to former president Jimmy Carter and his family while he was in the White House. In May of 2002, Inside Tennis named the "Brennan Clan," Frank Sr., Jr. and III, to their top-10 list of "Guys Who Have Lent A Hand" to women's tennis.
Brennan resides in Mountain View, Calif., with his daughter, Francesca.