How do you address a person with both PhD and JD?

The most common and respectful way to address someone with both a PhD and a JD is Dr. [Last Name]. The PhD is generally considered the more prestigious academic title, and using "Dr." covers both degrees appropriately.

You could also use their full name, "Dr. [Full Name]", particularly on a formal first introduction. However, once you've established a relationship, sticking with "Dr. [Last Name]" is perfectly acceptable and preferred.

Avoid using both titles (e.g., "Dr. [Last Name], JD, PhD") as it is redundant and can sound overly formal or pretentious.