Okay, "logistics optimization"???
In the US there have been a few, i.e., apparently less than 20, universities with an applied math program up to date in and teaching optimization.
Sooooo, anyone at all seriously interested, long, for decades, would, could, should visit some of those math programs, meet some of the profs, get recommendations for their former students, call them, chat, and offer a job better than their current lawn mowing, fast food restaurant kitchen cleaning, or car washing. Instead of just the US, might also consider Waterloo in Canada. Actually the Chair of my Ph.D. orals committee specialized in optimization in logistics. After sending 1000+ beautifully written resume copies and hearing back nothing, can begin to conclude that optimization is not a hot field and for highly dedicated optimizers who want to sleep on a cot in a single room, forgo bathing, most days eat bread, other days peanut butter, have no children, wife, or family contact, don't own a car, and must get any needed medical care from some of the last resort special clinics. Ah, real optimization!