While at NBCUniversal, Lassen was active in their corporate diversity initiatives and was part of the team that led the company to be named one of the best places to work for LGBT employees.
[4][7][8] When Lassen joined the production of the Deaf West Theatre revival of Spring Awakening in 2015, it premiered at Inner-City Arts' Rosenthal Theater in L.A.
[1] Lassen teamed up with producers Ken Davenport and the Deaf West Theatre,[9] and transferred the show from the 99-seat Los Angeles production to Broadway in just 366 days, an unprecedented feat.
[9] For the show, performed in both American Sign Language and spoken English,[11] the producers were honored with the Champion of Change Award by the New York Mayor's Office for People with Disabilities for their "efforts to increase diversity and inclusivity on Broadway.
Lassen's upcoming projects include How I Learned To Drive, a Pulitzer-winning play by Paula Vogel opening on Broadway in 2021, with much of the original cast and creative team from its off-Broadway debut 23 years prior, Alice By Heart, a new musical by Duncan Sheik, Steven Sater and Jessie Nelson, premiering at MCC Theater in February 2019;[15] and Some Lovers, a new musical by Burt Bacharach and Steven Sater opening at the Adirondacks Theatre Festival in June 2018.