Prior to joining Sellers Dorsey, Dan was the co-owner of HealthDataViz, providing technical expertise, team leadership, and staff development; he was responsible for the content of all technical training programs. He was the lead author of the book Tableau for Healthcare. He has collaborated with healthcare clients to build databases and create hundreds of timesaving, high-impact reports. He has also worked to train Tableau developers for hospitals, payers, public health organizations, professional associations, and government agencies. Before HealthDataViz, Dan worked as an independent data analytics and visualization consultant supporting healthcare, education, and industry.