Mike co-founded the firm of Dean & Heimos LLC in 1995 immediately after graduating law school, and since has continued with the firms of Mullin Dean & Heimos LLP and now Michael A. Heimos PC. His concentration is in counseling non-US citizens anticipating US residency or immigration, and investing in US properties and enterprises, as well as vice versa relating to US citizens.

He has grown a national reputation both as a practitioner and as the author of commentary pieces. The latter includes two major works for legal publisher BNA Tax Management, the Portfolios T.M. 837 2nd, Non-Citizens: Estate, Gift and Generation Skipping Taxation, and T.M. 806, Immigration and Expatriation Law for the Estate Planner. A third Tax Management portfolio is in the works, concerning the taxation of insurance companies. Other publications include chapters for compilations published by West Publishing and Chancellor Publishing, and of articles for Tax Management and the periodicals Asset Protection Journal, American in Britain and the American Bar Association’s Asset Protection Strategies.

It has also been his privilege to have impacted the law itself as several of his comments to IRS-proposed regulatory changes have shaped resulting rules. Mike is a frequent speaker and participates as faculty in continuing legal and other continuing education courses and similar business conferences.

Mike is licensed to practice in the state of Colorado and in the US Tax Court and Federal District Court in Colorado. Current professional affiliations and memberships include the American Bar Association; the Colorado Bar Association; the BNA Tax Management Estates, Gifts and Trusts Advisory Board; and the Society of Trust and Estate Practitioners (STEP). He earned his law degree from the University of Denver, College of Law and undergraduate degree from Benedictine College.

In his personal time he writes, engages in outdoor sports, studies medieval European and Middle Eastern history, enjoys music, travel and cuisine. He is a member of several habitat conservation groups and is a contributing member of the Medieval Academy of America.