Reproducible Finance is a blog that accompanies Reproducible Finance with R: Code Flows and Shiny Apps for Portfolio Analysis.
You can find the data needed for the book here, you can find the code from all the chapters here and you can find the code for the Shiny apps that are built in the book here. Visit http://www.reproduciblefinance.com/.
To contact Jonathan Regenstein, see http://www.reproduciblefinance.com/start-here/