Influenced by the
Bauhaus movement, it is probably no coincidence that Mrkusich's first solo exhibition was held at
The University of Auckland's School of Architecture in 1949. Mrkusich was heavily involved in the work of Brenner Associates. Formed in 1949, Brenner Associates comprised architects
Stephen Jelicich, Desmond Mullen and
Vladimir Čačala, working with Mrkusich and designer John Butterworth. Aside from architectural work, Brenner offered integrated interior, exhibition, lighting and furniture design, for which Mrkusich contributed interior and furniture design, as well as designing and building his own (award-winning) home (1950). Mrkusich was also responsible for the design of several murals, mosaics and stained glass windows, including the windows of St Joseph's Catholic Church, Grey Lynn, Auckland (1958–60) and the B.J. Ball Paper mural in Graham Street, Downtown Auckland. ==Developing abstraction==