Design Director David Sieren’s experience encompasses user-research and brand strategy as well as interactive design. At One Design, he’s at the forefront of brand and communication strategy for our client portfolio. Formally trained as a designer, throughout his career he’s been involved in design and branding initiatives for clients large and small, including Caterpillar, Jones Lang LaSalle, Nike, Herman Miller Healthcare and others. David is part of the Post Family, President of AIGA Chicago, and adjunct faculty at DePaul University.