Wallace came to BYU as a physical education teacher in 1956 and continued to teach a wide variety of classes through the early 1990s. She also coached the women's gymnastics team from 1963-76, leading the Cougars to eight Intermountain Conference for College Women in Physical Education titles.
A national judge of local, state, and regional U.S. Gymnastics Federation meets, she designed numerous judges' tests for national certification in gymnastics. She also served on several committees at conference, regional, and national levels, including the NCAA Division I Volleyball Committee and the USGF Test Administrator and Certification Committee.
Administrator of women's athletics from 1972-95, Wallace became the chief architect in building BYU's women’s athletic program to national prominence. From the early 1970s, when Title IX began its impact on intercollegiate athletics, she helped to lead and develop BYU's emerging program with discernment, integrity, and humor.
“Lu is the founder of [women's] intercollegiate athletics at BYU,” said the late Elaine Michaelis, who passed away a year ago on April 2 and had worked alongside Wallace as the head coach of BYU women's volleyball during Wallace's career. “She led the program from the Sports Day era (when the women’s sports season lasted all of one weekend) to the complex era of NCAA national championships.”
During her administration, BYU dominated the Intermountain Athletic Conference, the High Country Athletic Conference and the Western Athletic Conference. Each of the nine sports under her supervision placed in the nation's top 15 at least once, with several teams regularly placing in the top 10.
The coaches Wallace supervised during her time at BYU received national, regional, and league honors; more than 100 athletes were named to athletic and academic All-America teams or won national academic awards or scholarships; and eight athletes won national individual titles.