Marco Russo and Alberto Ferrari co-founded SQLBI.COM, where they regularly publish articles about DAX and other Microsoft tools for data analytics and business intelligence (BI). They speak regularly at major international conferences, such as TechEd, PASS Summit, SQLRally, and SQLBits. Both currently consult and mentor on BI and Microsoft BI technologies. Their many books include Analyzing Data with Power BI and Power Pivot for Excel, Introducing Microsoft Power BI, and Microsoft Excel 2013 Building Data Models with PowerPivot.