Founder of HTPBE, a structural PDF forensics tool. I work on detecting whether a document was modified after it was created — reading the file's structural layer (cross-reference tables, incremental-update history, metadata, signature state) rather than its pixels. I can speak to document-tampering techniques, why edited bank statements and invoices pass OCR and visual review, and what fraud/risk teams in lending and insurance can actually check at the file level.