About Jonathan Leff
Jonathan Leff is a director at Larimar Therapeutics.
Form D filings name Jonathan Leff as a director at Avalyn Pharma and Adaptive Phage Therapeutics.
Jonathan Leff reports to the SEC as a director or major shareholder of 14 public companies, including BiomX (PHGE), ARS Pharmaceuticals (SPRY) and Protara Therapeutics (TARA).
Jonathan Leff first appears on SEC filings in 2006.
Experience
This experience comes from SEC filings. The years are when the filings name Jonathan Leff in the role, so the role may have started earlier or lasted longer.
LI
Larimar Therapeutics, Inc.
Director
2020 – 2026 · Public company (LRMR)
BI
BiomX Inc.
Director
2024 – 2025 · Public company (PHGE)
AI
ARS Pharmaceuticals, Inc.
Director
2022 · Public company (SPRY)
PI
Protara Therapeutics, Inc.
Director
2017 – 2018 · Public company (TARA)
AI
AveXis, Inc.
Director
2016 · Public company (AVXS)
AI
Alpine Immune Sciences, Inc.
Director
2015 · Public company (ALPN)
II
Intermune Inc.
Director
2006 – 2013 · Public company (ITMN)
AI
Allos Therapeutics Inc.
Director
2006 – 2012 · Public company (ALTH)
TI
Talon Therapeutics, Inc.
Director
2010 – 2012 · Public company (TLON.OB)
II
Inspire Pharmaceuticals Inc.
Director
2007 – 2011 · Public company (ISPH)
ZI
Zymogenetics Inc.
Director and 10% owner
2006 – 2010 · Public company (ZGEN)
NC
Neurogen Corp.
Director
2006 – 2008 · Public company (NRGN)
AI
Altus Pharmaceuticals Inc.
Director and 10% owner
2006 – 2008 · Public company (ALTU)
VI
Viracta Therapeutics, Inc.
Director and 10% owner
2006 – 2008 · Public company (VIRX)
Key Colleagues at Startups
The people Jonathan Leff works with at each company, as listed on that company's latest Form D.
Avalyn Pharma Inc. · Form D, Oct 10, 2023
LB
Lyn Baranowski
Chief Executive Officer and director
TA
Tiba Aynechi
Director
KP
Ketan Patel
Director
PM
Peter Moldt
Director
ND
Niall O'Donnell
Director
CL
Cassandra Luca
Director
JC
Jill Carroll
Director
Adaptive Phage Therapeutics, Inc. · Form D, Jun 9, 2023
JJ
Jana Jensen
Director
CM
Carl Merril
Director
IH
Ian Hardy
Director
MO
Michael Orndorff
Executive officer
GM
Gregory Merril
Chief Executive Officer and director
JG
Jesse Goodman
Director
RM
Raymond Martz
Director
MH
Martin Heidecker
Director
EL
Evan Loh
Director
SB
Subhendu Basu
Executive officer