Michael retired from Rolls-Royce Corporation's LibertyWorks unit early in 2013 and decided to continue the practice of law in the Probate and Tax areas.  In 2015 he teamed up with Gregory S. Dunn (also recently retired from Rolls-Royce) to form Nellinger & Dunn LLP.  The firm focuses on International Business Transactions and International Regulatory Compliance, in addition to the Probate and Tax areas.  Michael and Gregory have a combined 35 years of experience in international business and regulatory compliance.

Following retirement, Mr. Nellinger has also devoted a significant portion of his time to volunteer activities, including working with the Indianapolis Community Emergency Response Team and the Amateur Radio Emergency Services groups.  He holds an Amateur Extra radio license with call sign KC9YBH.