Cardiff South and Penarth MP Alun Michael has been nominated as Labour's candidate for south Wales with his son, Tal Michael, representing north Wales.
Prof Martin Innes, director of the Police Science Institute at Cardiff University, said he was optimistic the reforms would work, despite the challenge of a public spending squeeze.
"I think one of the things to say about looking forward is this is going to be an incredibly challenging role," he said.
"There's been lots of debate about politicisation and what could go wrong with it.
"But actually we know that public services are going to see reductions in funding and it's going to be very difficult, I think, for any police and crime commissioner to square, if you like, public demand for policing and the resources that they have actually got available."