studio three twenty one is a professional lighting design services firm focused on the integration of lighting within the built environment. the firm was founded in 2001 by partners that established the san francisco office of francis krahe & associates in 1993 and collaborated together for over two decades. keith kosiba is the founding principal and design director. meaghan shinnefield is a principal and the managing director. together they are responsible for the management and creative direction of the firm. they supervise the development of each project from concept through construction.