Tim was receptive to possibilities, changes, and the culture of iteration. He didn't become overly attached to a single interpretation or solution, rather he kept an open mind to testing and validating different ideas. Tim was also very good at relationship building and making himself accessible to his teammates. His attitude was positive and easy-going which facilitated rapport building. He always provided feedback in a respectful method and was extremely reliable for delivering on his commitments. Tim planned the tasks very deliberately and spent his time wisely, even during stressful situations. And, very importantly, he was able to discriminate when was a good time to rapidly prototype and when was appropriate to zero in on polish, which I feel is an important skill for truly effective designers.