Phone: (405) 235.7000
Fax: (405) 996.3403
E-Mail: lcason@hartzoglaw.com

• Business transactions and ongoing representation of business clientele
• Tax and estate planning for affluent individuals and families
• Tax controversies

• Fellow in American College of Tax Counsel since 1989
• Fellow in American College of Trust and Estate Counsel since 1997
• Listed one of Oklahoma Super Lawyers (Business/Corporate)
• Listed in The Best Lawyers in America in the following practice areas:
  Corporate Law
  Tax Law
  Trust and Estates
• Listed in Chambers USA Guide to America’s Leading Lawyers
• Adjunct Professor of Law at the University of Oklahoma College of Law since 1981. Courses taught include Partnership Tax and Corporate Tax
• Associate attorney with Rain Harrell Emory Young & Doke of Dallas, Texas from 1976 to 1979
• Captain, United States Air Force, JAGC, 1972 to 1976
• Member Advisory Task Force on Oklahoma Corporate Income Tax Reform
• Commentator for Leimberg Financial Services, 2008. 

• State Bars of Oklahoma, Texas and California
• Past Chairman of the Section of Taxation of the Oklahoma Bar Association

• University of Oklahoma (B.A.,1969)
• University of Oklahoma, College of Law (J.D., 1972) (Oklahoma Law Review and Order of the Coif)
• Southern Methodist University School of Law (Masters of Law in Taxation, 1979)  

• Len has authored tax articles for:
  Leimberg Financial Services
  The Oklahoma Bar Journal
  The Texas Bar Journal
  Prentice Hall – Oil & Gas Taxes
• He has also published the following articles in Estate Planning Magazine:
  Maximizing Funding of Credit Shelter Trust With Non-IRA Assets, June 2002, Vol. 29, No. 6
  IRS Approves Poorer Spouse Funding Technique, May 2004, Vol. 31, No. 5
• The "Just Enough" Funding Technique: An Innovative New Strategy, June 2008, Vol. 35, No. 6

• Chairman of the Board of Directors, Oklahoma Medical Research Foundation
• Director, Oklahoma City Public Schools Foundation
• Former Member, Camp Classen Board of Directors
• Former Member, Oklahoma City YMCA Board of Directors
• Board of Directors, Investrust  

• Wife Donna and sons Trent, Paul and Roger
• Britton Christian Church, Elder