About Us Law Office of Marc A. Austin, PC 3521 North University Avenue Suite 200 Provo, UT 84604. Probate and Estate Planning are the main areas of practice for our law firm. We also handle complex tax planning matters, estate & gift tax planning, and business planning for corporations and LLCs. This often benefits our clients as there is overlap between probate and tax law and having an attorney that understands both can save you time and money.