David Tappeiner was born and raised in Santa Barbara.  He earned his bachelor’s degree in 1997 (Law and Society) from the University of California, Santa Barbara.  Thereafter, David moved to Colorado with his wife and daughter, intending to stay there.  While there, he attended the University of Denver College of Law, receiving his law degree in 2000 and was a member of the Denver University Law Review from 1998-2000.  

David practiced law in Denver, Colorado from 2000-2006 but returned to Santa Barbara in 2006 after receiving an offer to join the law firm of Fell, Marking, Abkin, Montgomery, Granet & Raney, LLP, becoming a partner there in 2008.  In 2020, David finally acted upon his desire to

start his own law firm with one his best friends, Mark A. DePaco.  Mark and David founded DT Law Partners, LLP as equal partners in August 2020.

David focuses his practice on estate and trusts and all matters related thereto, which includes preparation of moderate to complex estate planning documents, trust and estate administration, conservatorships, and trust and probate litigation.

David is admitted to both the State Bar of California (2006) and State Bar of Colorado (2000), is a member of the State Bar of California Trusts and Estates division, and has been certified as a Legal Specialist in Estate Planning, Trusts, & Probate by the California State Bar. David has an AV rating (preeminent) with Martindale-Hubbell and is a member of the Santa Barbara Estate Planning Council. David is also admitted to the United States Tax Court and the Federal District Court for the 10th Circuit. David has also routinely given lectures for NBI, Lorman, and others on various estate and trust topics.

David is passionate about his family, especially his three amazing children.  David also enjoys coaching youth soccer.  He has coached youth soccer for almost 20 years and currently coaches at Dos Pueblos High School. He has served on the board for CALM and currently serves on the local AYSO board.


Mark earned his B.A. degree from the University of California, Los Angeles (UCLA) in 1994. He received a law degree (J.D.) from the University of Southern California Law School (USC) in 1998 and is admitted to practice in California. He is the founding partner of the law firm DT Law Partners, LLP, in Santa Barbara, California, formed in 2020. Prior to joining that firm, he was a partner at Fell Marking LLP, in Santa Barbara, for ten years. Mark began his legal career as an associate with Hatch & Parent and transitioned shortly thereafter to Stradling Yocca Carlson & Rauth P.C., helping to establish their Santa Barbara office. Mark then moved to the San Francisco Bay Area, and spent eleven years there, practicing and growing his business at MBV Law LLP, before deciding to make the move back to his hometown of Santa Barbara. 

For more than twenty years, Mark’s legal practice has focused on corporate transactions, including securities offerings, debt and equity raises, mergers and acquisitions, and all matters related to corporate and business growth. Mark operates as outside general counsel to companies in all lines and phases of business, and counts angel investors, investment companies, funds and family offices among his clients. 

Mark currently serves on the Board of the Dream Foundation, is active in youth sports, and, along with his wife, is raising four young, active children.