One of my dearest professors has recommended me to a global health professor in a great US university to pursue a Ph.D. in global health. And, the second professor also is inviting me to apply there. What is your opinion about a Ph.D. in global health? Do you think it is not a time-wasting process to follow global health in an academic setting? Some say, for global health, you should be in the playfield and not in the classrooms! What What do you think? Also what between Ph.D. and a MPH in global health? Please share your opinion; your thoughts are constructive for me.