What were the topics and titles of your dissertation in the first two PhD? Were they related to this topic or totally different?
Edit: https://www.mathgenealogy.org/id.php?id=61429 It looks quite unrelated
Edit: https://www.mathgenealogy.org/id.php?id=61429 It looks quite unrelated
https://www.researchgate.net/publication/258423577_Data_Stor...
Clearly they have been working on this for over a decade.