About Mark
Mark Cannon trained first as a business analyst and then as a lawyer. He earned a Bachelor of Science from Indiana University Bloomington in 1986 and a Juris Doctor from the University of Louisville in 1994. His legal studies emphasized tax, estates and trusts, and business and corporate law, areas that would shape his subsequent career.
He began his public-sector legal work at the Indiana Department of Revenue in 1994, where he served as an inheritance tax lawyer. That early role placed him at the intersection of state tax policy and private estate administration. In 1997 he moved into the private sector as an estate tax specialist for RJ Pile & Company LLC, handling tax analysis and compliance for estates and related transactions. Two years later he joined O Koon Hintermeister as a lawyer, a position he has held since 1999.
Cannon’s résumé reads like a steady progression into increasingly specialized tax and estate work. He has experience on both sides of the ledger: applying state tax rules within a government agency and advising estate clients in private practice. His education in business analysis and his legal training in tax and corporate matters give him tools to address the technical and practical aspects of estate planning and administration.
He is licensed to practice in Indiana and has been active in local and state bar groups. He has been a member of the Indianapolis Bar Association since 1994. He also holds membership in the Indiana State Bar Association, a connection he maintains alongside his local bar involvement. Those memberships reflect an ongoing engagement with professional networks and the legal community in Indianapolis and across the state.
Colleagues describe Cannon as methodical in handling complex tax and estate questions, and clients have relied on him for detailed guidance when estates involve business interests or intricate tax consequences. His background in business analysis complements the tax-focused aspects of his legal work, helping him translate financial and corporate issues into practical steps for estate planning and settlement.
He continues to practice in Indiana, where his work centers on estate and inheritance tax matters, estate planning, trusts and related business and corporate law issues.
