Dr. Claus Hartmann had to cope with a special house challenge with the NEW 4.0 Science Congress, which was held as a hybrid format due to the pandemic situation. With over 20 live broadcasts, key notes, breakout sessions and panel discussions, it was going to be exciting: Does the connection hold, is the sound right, are the lecture and speaker easy to see? Claus Hartmann led through the event in a sovereign and at the same time humorous manner, and spontaneous changes of plan were skilfully bridged. At the same time, as an expert in sustainability, Claus Hartmann was able to take questions from the audience very well and integrate and develop them in the further course of the discussion. This gave an event that was largely conducted digitally an interactive character in which the audience was involved and carried along. The cooperation during the preparation was also uncomplicated, reliable and very trusting. We are already looking forward to organizing the next event with Dr. Claus Hartmann.