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Thomas DesRosier
General Counsel at
SERES THERAPEUTICS, INC.
Net worth: 58 223 $ as of 2026-05-30
Profile
Thomas J.
DesRosier is currently Director at Avanir Pharmaceuticals, Inc., Director at Optimer Pharmaceuticals LLC since 2013, and Chief Legal Officer & Executive Vice President at Seres Therapeutics, Inc. since 2016.
Former positions include Director at Trius Therapeutics, Inc.; Assistant General Counsel-Patents at Wyeth LLC; Chief Patent Counsel & Vice President at Genetics Institute LLC; Secretary, Chief Legal & Administrative Officer at ARIAD Pharmaceuticals, Inc. from 2015 to 2016; Secretary, Chief Legal & Administrative Officer at Cubist Pharmaceuticals LLC from 2013 to 2015; Chief Legal Officer, SVP & General Counsel at Genzyme Corp.
from 1999 to 2011; Senior Vice President & General Counsel at Sanofi from 2011 to 2013; and Principal roles at Wyeth Pharmaceuticals LLC, Lantheus Medical Imaging, Inc., and Dupont De Nemours & Co., Inc. Education includes undergraduate studies at the University of Vermont and graduate studies at Wake Forest University School of Law.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
| 2026-05-17 | 7,954 ( 0.08% ) | 58 223 $ | 2026-05-30 |
Thomas DesRosier active positions
| Companies | Position | Start |
|---|---|---|
| SERES THERAPEUTICS, INC. | General Counsel | 2016-05-15 |
Optimer Pharmaceuticals LLC
 Optimer Pharmaceuticals LLC Pharmaceuticals: MajorHealth Technology Operates as a biopharmaceutical company that develops and commercializes anti-infective products | Director/Board Member | 2013-10-23 |
Former positions of Thomas DesRosier
| Companies | Position | End |
|---|---|---|
| ARIAD PHARMACEUTICALS, INC. | Chief Administrative Officer | 2015-12-31 |
| CUBIST PHARMACEUTICALS INC | Chief Administrative Officer | 2015-01-21 |
| SANOFI | General Counsel | 2012-12-31 |
Genzyme Corp.
 Genzyme Corp. Pharmaceuticals: MajorHealth Technology Develops and manufactures therapies for rare diseases, multiple sclerosis, immunology & oncology | General Counsel | 2010-12-31 |
| AVANIR PHARMACEUTICALS INC | Director/Board Member | - |
Training of Thomas DesRosier
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
76
1st degree connections
15
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 15 |
|---|---|
Wyeth Corp.
 Wyeth Corp. Pharmaceuticals: MajorHealth Technology Develops, manufactures and distributes pharmaceuticals, vaccines & biotechnology products | Health Technology |
Genetics Institute LLC
 Genetics Institute LLC Pharmaceuticals: MajorHealth Technology Develops pharmaceutical products | Health Technology |
ARIAD Pharmaceuticals, Inc.
 ARIAD Pharmaceuticals, Inc. BiotechnologyHealth Technology Discovers, develops and commercializes small-molecule drugs for the treatment of cancer | Health Technology |
Cubist Pharmaceuticals LLC
 Cubist Pharmaceuticals LLC Pharmaceuticals: MajorHealth Technology Engages in research, development and commercialization of pharmaceutical products | Health Technology |
Avanir Pharmaceuticals, Inc.
 Avanir Pharmaceuticals, Inc. Pharmaceuticals: MajorHealth Technology Develops therapeutic products for the treatment of nervous system disorder | Health Technology |
Genzyme Corp.
Genzyme Corp. Pharmaceuticals: MajorHealth Technology Develops and manufactures therapies for rare diseases, multiple sclerosis, immunology & oncology | Health Technology |
Sanofi
 Sanofi Pharmaceuticals: MajorHealth Technology Engages in research, development and production of pharmaceuticals & vaccines | Health Technology |
Wyeth Pharmaceuticals LLC
 Wyeth Pharmaceuticals LLC Pharmaceuticals: MajorHealth Technology Develops, manufactures and markets infant pharmaceutical products | Health Technology |
Lantheus Medical Imaging, Inc.
 Lantheus Medical Imaging, Inc. Medical SpecialtiesHealth Technology Develops and manufactures radio diagnostics | Health Technology |
University of Vermont
 University of Vermont Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Optimer Pharmaceuticals LLC
Optimer Pharmaceuticals LLC Pharmaceuticals: MajorHealth Technology Operates as a biopharmaceutical company that develops and commercializes anti-infective products | Health Technology |
Trius Therapeutics, Inc.
 Trius Therapeutics, Inc. Pharmaceuticals: MajorHealth Technology Develops antibacterial drugs for the treatment of infections | Health Technology |
Dupont De Nemours & Co., Inc.
 Dupont De Nemours & Co., Inc. Agricultural Commodities/MillingProcess Industries Manufactures hybrid corn and soybean seeds | Process Industries |
Seres Therapeutics, Inc.
 Seres Therapeutics, Inc. BiotechnologyHealth Technology Develops novel treatments for diseases related to the human microbiome | Health Technology |
Wake Forest University School of Law
 Wake Forest University School of Law Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
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