Hendrik Groen published his first diary in 2014. The Secret Diary of Hendrik Groen, 83. Years Old was an enormous success: there is an actual Hendrik Groen fan club, foreign rights were sold to 36 countries, a television series was produced, and it was adapted into a play. His second diary, As Long As There Is Life, has also been a huge bestseller. His diaries have sold over 550.000 copies in the Netherlands and Flanders, and they both received the Dutch Railways Public Award. His novel Live and Let Live was published in June 2018 and went straight to #1 in the bestseller lists. Hendrik Groen is a pseudonym.