As an actor and dancer he played Tulsa in Gypsy with Mabel Manzotti, Ambar La Fox, Sandra Guida and Eleonora Wexler.
[1][2] From the year 2000, Zajac began working in the city of Buenos Aires as assistant director and choreographer for various musicals such as "La Tiendita del Horror" directed by Robert Jess Roth and Matt West and played by Sandra Ballesteros and Diego Ramos.
[8] In addition, he was choreographic director of the tango shows "Tangorama" in 2006,[9][10] "Bien Argentino" in 2008 and "Puerto Buenos Aires" in 2009, where he worked with the artists Mora Godoy, Patricia Sosa, Laura Fidalgo and Maximiliano Guerra.
In 2013 he returned to national television as the director of choreography for the program "Your Face Sounds Familiar", hosted by Alejandro Marley Wiebe for Telefé.
Artists from the cycle included Carmen Barbieri, Lucía and Joaquín Galán from the Pimpinela duo, Laura Esquivel, Pablo Granados, Martín Campi Campilongo, Rocío Girao Diaz, Jey Mammon and Benjamín Amadeo.
[2] In 2003 he traveled to New York, convened by the creative team of "Nine" on Broadway to work on a version of that musical played by Antonio Banderas and Chita Rivera.