Paul Mitchell was Head of Recruitment at Southampton from January 2012 (the window before they were promoted to the Premier League) to November 2014 (the year Koeman took over). Plenty of hits in that time (Mane, Tadic, Bertrand, Alderweireld, Forster, Wanyama, Lovren, Rodriguez, Clyne, Davis) but also some major misses (Gaston, Mayuka, Forren, Osvaldo, Gardos, Taider). Gaston, Gardos, Taider, and even Mayuka were probably worth the risk but Forren and Osvaldo (who might have been Pochettino's request) were disasters.
Moved from Southampton to Spurs to perform the same role but left last March. Made some decent moves (Alli, Son, Alderweireld again, Trippier, Wanyama again) but a fair number of poor ones (Janssen, Sissoko, N'Koudou, Wimmer, N'Jie), although, again, I'd argue that a few of those that didn't work out were worth the risk (Janssen, N'Jie, Wimmer) and Sissoko was reportedly Levy's decision, so he's absolved of that.
He's unattached, anyhow. If Premier League experience is so important to us, he might be someone worth considering. Walsh might be a good scout but he is not suited for the job he's doing now.