Hasbrouck Peterson Zimoch Sirirattumrong and its predecessor firms have been providing architectural, engineering, interior design, planning and construction consulting services to a wide variety of public and private clients through its offices in Chicago, Illinois since 1976. In 1999 HPZS opened an office in Bangkok, Thailand which has serviced numerous projects in the Far East.  The programming, design, construction documentation, construction administration & management services offered by the firm are complemented by unique and specialized experience with Historic Preservation, Adaptive Reuse, Prefabrication, and Materials and Building System Failure Analysis. Hasbrouck Peterson Zimoch Sirirattumrong has received numerous national, state, and local awards for its work in these areas.

Projects managed by the firm have included work on a wide variety of structures, both large and small, ranging from work on the Museum of Science and Industry; the University of Illinois at Chicago South Campus Development; and The Rookery Office Building in Chicago, to the Dana Thomas House Museum in Springfield, Illinois; the recreation of an early American fort at Fort Massac State Park in Metropolis, Illinois; the adaptive reuse of a centennial farm into a community center in Deer Park, Illinois; and lighthouses in North Carolina, Florida, Texas, Michigan, Maryland and Georgia. 

Hasbrouck Peterson Zimoch Sirirattumrong prides itself on being able to recognize and understand the goals of a building program; interpret those goals into spatial development and construction design that is imaginative, responsive, cost effective, and compatible with surrounding elements and cultures; and effectively and efficiently communicate that information to its clients and into the field where the work is finally executed.

The current staff of architects and engineers provides complete professional building services.  In house expertise with engineering and construction management services ensures detailed coordination between all professional building services and results in more efficient project management. The staff has skill and experience in working on new building programs; expanding existing buildings, adapting existing buildings and spaces to new uses, incorporating contemporary building services into the fabric of existing structures; and resolving existing building problems. The firm is organized to rapidly and efficiently complete projects within established budgets and schedules. The evaluation of landmark status, code and building resolutions, life safety, and accessibility compliance and related costs are areas of particular expertise. The professional staff is often supplemented by consulting firms offering specialized services in landscape, acoustical, lighting, exhibit, geotechnical, mechanical, electrical, food service, security, industrial hygiene, and fire protection design.