Leff Jonathan S
SEC-identified person · CIK 1215242 Identifier-verified
Public-company roles (from insider filings)
| Company | Capacity as filed | Filings |
|---|---|---|
| Zafgen, INC. ZFGN | Director | filed 2020 - 2026 |
| Chardan Healthcare Acquisition Corp. PHGE] | Director | filed 2024 - 2025 |
| Silverback Therapeutics, Inc. SPRY | Director | filed 2022 - 2022 |
| Protara Therapeutics, Inc. TARA | Director | filed 2017 - 2018 |
| Avexis, Inc. AVXS | Director | filed 2016 - 2016 |
| Nivalis Therapeutics, Inc. NVLS | Director | filed 2015 - 2015 |
| Intermune INC ITMN | Director | filed 2006 - 2013 |
| Allos Therapeutics INC ALTH | Director | filed 2006 - 2012 |
| Talon Therapeutics, Inc. TLON.OB | Director | filed 2010 - 2012 |
| Inspire Pharmaceuticals INC ISPH | Director | filed 2007 - 2011 |
| Zymogenetics INC ZGEN | Director | filed 2006 - 2010 |
| Neurogen Corp NRGN | Director | filed 2006 - 2008 |
| Altus Pharmaceuticals Inc. ALTU | Director | filed 2006 - 2008 |
| Viracta Therapeutics, Inc. VIRX | Director | filed 2006 - 2008 |
All roles under one Commission-assigned identifier - the same person by the SEC's own record, not by name matching. From the SEC's insider-transaction filings (Forms 3, 4 and 5). Every reporting director and officer carries a Commission-assigned identifier (CIK), so these footprints are identifier-verified - no name matching involved. Insiders file when they transact, so dates are filing dates: "last filed" never means "served until". This layer is not yet joined to the nonprofit register - identity joins ship only after independent review.