Mark has worked for 40 years in travel behavior research, with over 10 years in Europe and the rest based in California. He was a research associate at the University of Oxford's Transport Studies Unit and then a founding partner of the Hague Consulting Group. He has pioneered the use of Stated Preference survey methods in various choice contexts, and has also been one of the key innovators in the use of Activity-Based models for nearly 30 years. Mark has been based in Santa Barbara since 2002. He was Principal with RSG until 2023 before becoming a partner in Blue Door Strategy.

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