Ka dib markii uu ka helay Juris Doctor sanadkii 1973 Jaamacadda Virginia School of Law, Mueller wuxuu u shaqeeyay sidii dacwad oogaha shirkadda Pillsbury, Madison iyo Sutro ee San Francisco ilaa 1976. Kadibna wuxuu 12 sano ka soo shaqeeyay xafiisyada Xeer Ilaaliyaha Mareykanka. Wuxuu markii hore ka soo shaqeeyay xafiiska Xeer Ilaaliyaha Mareykanka ee Waqooyiga Degmada California ee San Francisco, halkaas oo uu ku koray inuu noqdo madaxa qeybta dambiyada, iyo 1982, wuxuu u guuray Boston si uu uga shaqeeyo xafiiska Xeer Ilaaliyaha Mareykanka ee Massachusetts isagoo ah Kaaliyaha Xeer Ilaaliyaha Mareykanka, halkaas oo uu ku baaray oo ku dacweeyay kiisaska laaluushka maaliyadeed, argagixisada iyo musuqmaasuqa dadweynaha, iyo sidoo kale shirqoolada daroogada iyo lacagaha la dhaqay ee ganacsiga caalamiga ah. Ka dib markii uu ka soo shaqeeyay shirkadda sharciga ee Boston iyo Barlow Hill, Mueller wuxuu u shaqeeyay dowladda ilaa 1976.
Jaamacadda Virginia School of Law