Looking for a trichologist or dermatologist in Washington, D.C. (early-onset hair loss)

Hey, I already saw a dermatologist but I’m looking for a second opinion. Does anyone know if there’s a trichologist in Washington, D.C. that isn't part of a private practice? If you don't know a trichologist, just recommend a solid dermatologist instead. I'm dealing with hair loss—21-year-old male. Thanks.