What is MPH?
Master of public health
Maybe look up what the journal says on this matter.
I did looked at many of journals where he submitted before. Usually, the PIs name comes last.
Among his >200 publications, 90% had his name as first author. Other 10% he had collaboration, so obviously, it came out of other lab (his name was in the middle).
He is also the corresponding author.
I posted this to know if anybody has the similar experience or not.