Belén Moneo Feduchi and Jeff Brock formed Moneo Brock Studio in 1993, when their first professional collaboration began with the loft at 6 TRIBECA in New York City. In December 1993 they became project architects for the office of Rafael Moneo Arquitecto. Most of this time was spent in Stockholm, running the project for the new Museums of Modern Art and Architecture, where they were responsible not only for developing the architectural details but also for the design of several furniture pieces and lamps displayed in the public spaces. In February 1995 they returned to New York to develop their own work while continuing to make numerous trips to Stockholm to supervise the construction of the Museums.

Since 1995, they have completed five more lofts in Manhattan, a house in Maine and a country house in the Stockholm archipelago. They also continued to work as project architects for Rafael Moneo in the U.S. on two more projects, the new Residency for The Embassy of Spain in Washington D.C. and a new studio building for the Cranbrook Academy of Art In Bloomfield Hills, Michigan. Both buildings were completed in 2002. Much of this work has been published in the United States and in Europe.

Moneo and Brock have also completed commissions for smaller work, including furniture. The bookshelf CHROMODULAR designed by Belen Moneo is currently being manufactured in Spain. Moneo and Brock have participated in various competitions, submitting proposals for a cultural center in Zamora, Spain, housing in Bilbao, Spain, an urban park and multipurpose center in Medina del Campo, Spain, an Art Museum in Skogards, Sweden, and for a Congress Hall in Cartagena, Spain.

In November 2001 the office moved to Madrid to begin work on a project for a Bath House for the Panticosa Resort in the Pyrenees. The new building will be partially built into the mountainside, exploiting its exceptional natural environment. The complex will house in approximately 8,500 m2 a Gymnasium, a Hydrotherapy Center, a Spa, a Solarium, and a Restaurant.