Callahan Corogin Architects (Hawaii) was established in 1989 as a full service architecture and interior design firm to meet the needs of resort corporations, real estate developers and professional firms. Callahan Corogin Studio (Bangkok)was established just two years later as a full service architecture and interior design firm serving Southeast Asia.

      In 1994, both firms were consolidated into one office
      based in Bangkok. Their combined strength now affords
      our clients a depth of working knowledge and the resources
      to support a variety of project types. These resources include
      the most sophisticated CADD services, in-house specification
      writers and a comprehensive international resources library.
       
      Through our dedicated managers and staff and our belief that
      the success of any project begins with an interactive design process
      with the client and his team, we are completing projects that exemplify
      the creative design process. Our interactive process reduces
      the potential for lengthy and costly changes. We build upon a series
      of progressive client approvals intended to keep our client fully
      informed of design options and impacts on the budget and schedule
      at each step of the design's evolution.
       
      We do not have a singular design style that overrides
      our client's desired image goals. Rather, our design
      direction springs from our client's functional, budgetary,
      and aesthetic programming parameters. Through our
      creative development process, designs emerge
      with a style that reflects enduring quality.