Thoughts on co-supervision
More mentors, more advice
People warned me about having multiple supervisors. They said the supervisors’ disagreements can put you in a crossfire. Looking back, I am confident that it was the best decision for my PhD.
You cannot beat asking questions from multiple experts in your field.1 A few precautions are advised: set up clear boundaries for splitting the funding, clarify who has the last word on what, and with whom you can work on it.
It will be your task to reconcile potentially differing opinions. This might seem a burden, but it misses the point of multiple perspectives, which are welcome for big life decisions.
You must communicate clearly: even if you think you told all your supervisors everything, do check explicitly. This can spare a lot of trouble.
In industry, people call it executive coaching, which costs a lot.