Kun Ren has used R for nearly 4 years in quantitative trading, along with C++ and C#, and he has worked very intensively (more than 8-10 hours every day) on useful R packages that the community does not offer yet. He contributes to packages developed by other authors and reports issues to make things work better. He is also a frequent speaker at R conferences in China and has given multiple talks. Kun also has a great social media presence. Additionally, he has substantially contributed to various projects, which is evident from his GitHub account:
I would like to thank my wife who encouraged me to start working on this book a year ago. I would also like to express my gratitude to the editors, Rohit Kumar Singh, Vivek Pala, and those who also worked hard behind this book. They did a great job making the writing and publishing smooth. Please help me rephrase if necessary, thanks.
