This is @Abhishek_Kar_AK's defence. His external was @jurpelai and I'd like to take a moment to say what a great job Johannes did and why. (1/n)
1) Start with the merit of the PhD. This sets the tone right off. He was very clear about how the PhD contributes to the field, even referencing his own work in the area and how this fills a gap in knowledge. sets the tone. 3/n