From Steven Greer's archive, 2000 when this email was written:

Currently a full professor of Aeronautical Engineering at St. Louis University, Paul Czysz teaches hypersonic aerodynamics. He spent 7 years at Wright-Patterson Air Force Base as an officer and as a civilian researcher; 29 years as an engineer at McDonnell-Douglas specializing in faster-than-sound aircraft design.

Part One:
https://dpiarchive.s3.us-west-1.amazonaws.com/0DFF88A8-89B0-4938-8EA8-8E6AFC2A1859/125618?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIASRR4G6UXH25CL2BB/20240927/us-west-1/s3/aws4_request&X-Amz-Date=20240927T013012Z&X-Amz-Expires=432000&X-Amz-SignedHeaders=host&X-Amz-Signature=f5ddcfdb8984679f7d5042d5c5dd0d4190dabb218c55d27e66e69025c7128241

Part Two:
https://dpiarchive.s3.us-west-1.amazonaws.com/C859E0E7-CDC1-4049-AFA3-899F6D93C538/125617?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIASRR4G6UXH25CL2BB/20240927/us-west-1/s3/aws4_request&X-Amz-Date=20240927T013012Z&X-Amz-Expires=432000&X-Amz-SignedHeaders=host&X-Amz-Signature=84ef50a4f2802184278b0d6616c53065d95c37d9f12db8aedaf56a37bd883bfc

Paul talks about how a majority of UFO sightings since the 50's are probably US military testing new tech. Tech that an everyday person could probably have explained to them, and they'd say "okay, I could see how that's possible." But he maintains that the 10-15% remain so unexplainable, that they must be created by something that wasn't us.