Laurent Bugnion is extremely well known and respected in the developer community. He is probably most famous for the creation of MVVM Light.
Laurent works as Senior Global Azure Advocate for Microsoft after almost 10 years spent working for IdentityMine and Valorem, two leading firms in Microsoft technologies. He is one of the foremost experts for XAML and C# based development. He codes in 
Windows, WPF, Xamarin (iOS and Android), Unity, ASP.NET. On his free time, Laurent writes for technical publications such as MSDN Magazine, and his blog is on blog.galasoft.ch. He is a frequent speaker at conferences such as Microsoft MIX, Build, TechEd, VSLive, TechDays and many other international events. Prior to joining Microsoft, Laurent was a Microsoft Most Valuable Professional for Windows development from 2007 to 2017, a Microsoft Regional Director from 2013 and a Xamarin Most Valuable Professional from 2015. He is also the author of the well-known open source framework MVVM Light for Windows, WPF, Xamarin, and of the popular Pluralsight reference course about MVVM Light.
And to top it all, there is now a book on using MVVM Light with Xamarin (including forms) from Apress