Mezzullo, a US-based estate planning and business succession planning attorney, has written extensively on taxation, estate and business succession planning, and employee benefits issues.

Based in Rancho Santa Fe, CA, Mezzullo will advise Withers' national and international clients as well as help expand the firm’s service to clients in California.

Mezzullo is the immediate past president of the American College of Trust and Estate Counsel, where he has also served as chair of the business planning, employee benefits in estate planning and elder law committees, and will chair the organization’s nominating committee this year.

He is also a former chair of the American College of Tax Counsel; current chair of the chapter 14 subcommittee of the estate and gift taxes committee of the American Bar Association section of taxation; former vice-chair of publications of the ABA section of taxation; and past chair of the ABA section of real property, trust and estate law.