Villa owner and chairman Dr Tony Xia told the club's website: "I'm pleased to welcome Steve to Aston Villa. It's an appointment I believe will be hugely important for the long-term global vision of the football club.
"I've discussed at great length with Steve during meetings the way in which I'd like to see the 21st century football club move forward and he has the same ideas and principles.
"This role will play a fundamental part in how we drive the football club forward with data and technologies playing a central role in how we not only scout new players but also make the best of the talent we have at Bodymoor Heath both at first-team level and throughout our academy teams."
Round added: "I am absolutely delighted to join such a great club with a superb support and historic tradition.
"The Technical Director role is something I've been working towards for a long time and once I had met the owner and seen his vision for the club I knew I wanted to be a part of it.
"There is a lot of hard work ahead but with the support of the Chairman and Keith Wyness, the expertise of Roberto and his excellent coaching team I am sure Aston Villa will re-establish itself as a highly successful football Club."