David H. Colby, J.D.
Estate Planning

Originally from Southern California, David moved to Arizona in 1979.

David received his J.D. from the University of Utah College of Law in 1979. He has been actively practicing in the greater Phoenix area for approximately 35 years, with the last 21 years emphasizing estate planning, business succession planning, and general business planning.


After serving as partner in some of the most prestigious law firms in L.A. and Phoenix, David founded his law firm in 2000 specializing in complex estate planning, irrevocable trusts and other business succession and estate planning. A testament to his work, many of his clients have been with him throughout his professional career.

At Colby & Thornes, David drafts and supervises the creation of revocable living trusts and related documents, irrevocable trust and other business succession and estate planning documents.

David specializes in strategies to meet clients’ long term planning goals.

David resides in Scottsdale with his wife Lisa; he has two children, Mikaela and Alana.

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Colby & Thornes is an Arizona Professional Limited Liability Company. The members of the company are David H. Colby and Megan A. Thornes. This website is intended to provide information about our practice and the legal services we offer. It is not intended to create, nor does it create, an attorney-client relationship. The website is informational only, and should not be relied upon as a substitute for legal advice from a licensed attorney at law.

Get In Touch

Colby & Thornes PLLC
Gainey Ranch Financial Center
7373 E. Doubletree Ranch Rd. Ste. 225 Scottsdale, Arizona 85258
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9am to 5pm Monday - Friday