Will Thalheimer, PhD, MBA, Principal at TiER1 Performance. Will is a world-renowned speaker, writer, researcher, consultant focused on research-based best practices for learning design, learning evaluation, and presentation design. At TiER1 (TiER1Performance.com), Will works with multi-capability teams helping organizations activate their business, operational, and learning strategies—through their people. Prior to TiER1, Will founded and ran Work-Learning Research for 22 years, where his research reviews are still available. Will wrote the award-winning book Performance-Focused Learner Surveys (second edition); created LTEM, the Learning-Transfer Evaluation Model and the Presentation Science Workshop. Will co-created The Learning Development Accelerator, and the eLearning Manifesto.