<p>Usually EE or Systems Engineering. To take courses in control systems without and undergrad degree in EE, one probably has to get a certificate in control systems. It may also be possible to get an emphasis in control systems as part of an interdisciplinary M.S./M.Eng degree because most graduate EE programs are going to require a BSEE or at least the circuits sequence.</p>
<p>Here is one of the University of Wisconsin branch campuses that has a control systems engineering emphasis as part of an interdisciplinary M.S./M.Eng degree.</p>
<p>[Degree</a> Requirements | Master of Science in Engineering | UW-Platteville Distance Education](<a href=“http://www.uwplatt.edu/disted/engineering-degree-requirements.html]Degree”>http://www.uwplatt.edu/disted/engineering-degree-requirements.html)</p>