Ninfa Arena. 18955 Memorial North, Suite 350. Humble Texas 77338 (28 1) 446-4644; fax (281) 446-0687. Email: ninfa_schettler@yahoo.com. If you believe that Heinrich G. Schettler, M.D., P.A. has failed to provide these services or discriminated in another way on the basis of race, color, national origin, age, disability, or sex, You can file a ....