Yaroslav has been involved in SharePoint solution architecture and implementation since 2003 and is also a Microsoft MVP since 2009. Yaroslav frequently presents at local and worldwide tech events as well as online; you can always find a fresh bit of SharePoint information on his blog: www.sharemuch.com; to learn everything

Yaroslav knows about SharePoint, check out his books: "Top 60 custom solutions built on SharePoint 2010", "SharePoint 2010 branding in practice", and "SharePoint 2010 and PowerShell Expert Cookbook"