Michael Ong has argued probate and Trust cases at all levels of the State Court system, including Kansas Supreme Court cases involving the law of undue influence, constructive trusts, the probate claims statute, and the Kansas spousal elective share statute. State appellate cases include those involving the Kansas Prudent Investor Act and the Missouri Will presentment statute.

Notable cases in which he has been lead trial and appellate counsel include:

The leading case by the Kansas Supreme Court on the law of Undue Influence: In re Cresto 358 P.3d 831(2015)

The leading case by the Kansas Supreme Court on the rights of a surviving spouse under the Elective Share Statute: In re Estate of Hjersted, 285 Kan. 559,175 P.3d 810 (2008)

The leading case by the Kansas Supreme Court on the law of Constructive Trusts: Estate of Draper v. Bank of America, 288 Kan. 510, 205 P.3d 698 (2009), along with its companion case Nelson vs Nelson 288 Kan. 570, 205 P.3d 715 (2009)

One of the most recent Kansas Appellate Court decisions addressing application of the Prudent Investor Act: Schartz vs Barker, 297 P.3d 1073 (Kan. Ct. App.20l3)

One of the most recent Missouri Appellate Court decisions addressing procedural aspects of the Will presentment statute in a will contest litigation: Salvation Army vs Bank of America, 435 SW3d661 (Mo. App. 2014)