Corey was born and raised in Sioux Falls, South Dakota. However, he began his professional career on the West Coast in Seattle, Washington. He was an assistant vice president and trust officer with one of the nation’s largest financial institutions. Corey transitioned to the practice of law at Hertog & Coster, PLLC where he focused on estate planning, probate administration and the representation of non-professional fiduciaries and professional fiduciaries, such as banks, trust companies and guardianship agencies. Corey joined Aiken, St. Louis & Siljeg, P.S. as a shareholder, where he continued to manage complex trust, estate and guardianship matters, but also expanded his practice into business planning and succession, real estate transactions, creditor rights and commercial litigation. Corey also served as a court-appointed trustee and personal representative in complex and contentious cases.
Corey was a longstanding member of the Washington State Bar Association’s Real Property & Probate Section and Guardianship and Elder Law Section, as well the King County Bar Association’s Real Property & Probate Section and Elder Law Section. Corey served two terms on the executive committee of the King County Bar Association’s Elder Law Section. In 2005, Corey was nominated and served as the chair of a committee with judges and court commissioners to draft forms to be used by guardians and trustees to report on their fiduciary activities. In 2012, Corey was nominated and served as co-chair of the Washington State Bar Association’s task force to revise the Uniform Durable Power of Attorney Act to reduce the financial exploitation of vulnerable and elderly persons.
After twelve years on the West Coast, Corey and his wife returned to Sioux Falls to be closer to their families. Upon returning to Sioux Falls, Corey served as an adjunct professor at a local university teaching employment law.
Corey joined Boyce Law Firm, LLP in 2013 and as a partner at the firm he focused on trust litigation representing fiduciaries, beneficiaries, and entities owned by trusts both nationally and internationally. He also continues a small estate planning practice and representing family members in guardianship and conservator proceedings. Corey is a frequent presenter at continuing legal education seminars for lawyers and is involved in legislative activities.
In 2020, Corey chased a long-held ambition to start his own business and opened Denevan Law Prof. LLC. where he continues his focus on trust and estate litigation, administration and planning as well as the other areas of law found on this website.
Professional Associations
South Dakota Bar Association
Second Circuit Bar Association
Washington Bar Association
King County Bar Association
United States District Court Western District of Washington
United States District Court of South Dakota
Wealth Counsel
International Fraud Group
