Marco Russo and Alberto Ferrari are the founders of sqlbi.com, where they regularly publish articles about Microsoft Power BI, Power Pivot, DAX, and SQL Server Analysis Services. They have worked with DAX since the first beta version of Power Pivot in 2009, and, during these years, sqlbi.com became one of the major sources for DAX articles and tutorials.
They both provide consultancy and mentoring on business intelligence (BI), with a particular specialization in the Microsoft technologies related to BI. They have written several books and papers about Power Pivot, DAX, and Analysis Services. They also wrote popular white papers such as “The Many-to-Many Revolution” (about modeling patterns using many-to-many relationships) and “Using Tabular Models in a Large-Scale Commercial Solution” (a case study of Analysis Services adoption published by Microsoft). Marco and Alberto are also regular speakers at major international conferences, including Microsoft Ignite, PASS Summit, and SQLBits.