Who is Ashley Tellis, Indian-origin expert in US, who came under fire for Chinese link?

Prominent Indian-origin strategist Ashley Tellis faces serious accusations of removing classified documents and meeting with Chinese officials. Authorities reportedly found over a thousand 'Top Secret' and 'Secret' documents at his residence during a raid. Prosecutors allege Tellis printed sensitive U.S. Air Force data and held discussions with Chinese representatives regarding international relations and technology.