[ptrott2017]

D is an initial but Dr. D. Richard Hipp has a PhD from Duke - graduated in 1992 (his thesis can be found here - its worth a read: http://bit.ly/2ygiDWx ) hence the Dr.

[interfixus]

Thank you. Always thought it was a weird comprehension error from the slightly unusual character-combo.

The weird error may have been mine.