Angelos Kostopoulos is listed as a Partner at Strati & Kostopoulos Law, a boutique firm described as combining legal and tax expertise. The firm serves clients from Athens and Washington, DC, and its work is framed around resolving legal, tax, and business challenges.

For public directory purposes, his profile is tied to tax services within a broader legal services setting. Listed credentials include AFSP, RTRP, and Atty, and the available service formats include in-person and remote support. The source material supports a profile focused on tax-related guidance connected with legal and business matters, without adding specific practice claims beyond the supplied facts.