You said you live in Silver Spring. We do, too, and use Nancy Richardson, who works from her home in the Woodmoor neighborhood (Four Corners). We LOVE Nancy. She does
https://phono-graphix.com/. She is amazing!!! Such a connection to our spirited and easily-frustrated child and to children in general, so inspiring, accessible, and flexible. Our child's evaluator (neuro-psych) also recommended Orton-Gillingham but said Phono-Graphix was fine, too. Our child loves to see Nancy and has improved so much!
nnelsonr1@verizon.net Good luck!