![Tomas Kiselak](data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="%231b1b1b" class="bi bi-person-fill" viewBox="0 0 16 16"><path d="M3 14s-1 0-1-1 1-4 6-4 6 3 6 4-1 1-1 1zm5-6a3 3 0 1 0 0-6 3 3 0 0 0 0 6"/></svg>)
Tomas Kiselak
Chairman at
VIRIDIAN THERAPEUTICS, INC.
Net worth: 43 M $ as of 2026-06-29
Profile
Mr. Tomas Kiselak is an Independent Director at Jade Biosciences, Inc., an Independent Director at Spyre Therapeutics, Inc., an Independent Director at Apogee Therapeutics, Inc., an Independent Chairman at Viridian Therapeutics, Inc., a Co-Manager at Viridian LLC and a Managing Member at Fairmount Funds Management LLC.
He is on the Board of Directors at Jade Biosciences, Inc., Jade Biosciences, Inc. (United States), Spyre Therapeutics, Inc. and Apogee Therapeutics, Inc. Mr. Kiselak was previously employed as an Independent Director by Dianthus Therapeutics, Inc., an Independent Director by Zenas BioPharma, Inc., a Laboratory Assistant by Harvard Medical School, a Managing Director by RA Capital Management LP, and a Managing Director by RA Capital Management LP (Private Equity).
He also served on the board at Viridian Therapeutics, Inc. /Old/.
He received his undergraduate degree from Amherst College.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
| 2026-06-22 | 406,038 ( 0.47% ) | 36 M $ | 2026-06-29 | |
| 2026-07-09 | 51,166 ( 0.09% ) | 7 M $ | 2026-06-29 | |
-.--% | 2026-03-11 | 0 ( -.--% ) | - $ | 2026-06-29 |
| 2026-06-30 | 0 ( -.--% ) | - $ | 2026-06-29 |
Tomas Kiselak active positions
| Companies | Position | Start |
|---|---|---|
| VIRIDIAN THERAPEUTICS, INC. | Chairman | 2021-05-31 |
| SPYRE THERAPEUTICS, INC. | Director/Board Member | 2023-06-21 |
| APOGEE THERAPEUTICS, INC. | Director/Board Member | 2023-05-31 |
| JADE BIOSCIENCES, INC. | Director/Board Member | 2025-04-27 |
Fairmount Funds Management LLC
 Fairmount Funds Management LLC Investment ManagersFinance Provides investment advice | Corporate Officer/Principal | - |
Viridian LLC
 Viridian LLC BiotechnologyHealth Technology Operates as a biopharmaceutical incubator company | Founder | 2015-12-31 |
Former positions of Tomas Kiselak
| Companies | Position | End |
|---|---|---|
| DIANTHUS THERAPEUTICS, INC. | Director/Board Member | 2025-03-03 |
RA Capital Management LP (Private Equity)
 RA Capital Management LP (Private Equity) Investment ManagersFinance RA Capital invests in both public and private companies located in the United States. The firm targets companies operating in the fields of healthcare and life sciences. It provides financing for pre-seed, seed stage, early stage and growth capital requirements . The firm acts as a lead and co-investor, makes follow-on investments and has a board seat requirement. | Private Equity Investor | - |
Viridian Therapeutics, Inc. /Old/
 Viridian Therapeutics, Inc. /Old/ BiotechnologyHealth Technology Operates as a biotechnology company | Founder | - |
| ░░░░░░░ ░░░░░░░ ░░░░░░ | ░░░░░░░░░ ░░░░░░░░░░░░░░░░░ | - |
Training of Tomas Kiselak
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
74
1st degree connections
12
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 12 |
|---|---|
RA Capital Management LP
 RA Capital Management LP Investment ManagersFinance RA Capital is a multi-stage investment manager that focuses evidence-based investing in public and private healthcare and life science companies which develops drugs, medical devices, diagnostics, services, and research tools. The firm’s portfolio of private and public companies spans the globe and most therapeutic areas across all stages from discovery through commercialization. | Finance |
Spyre Therapeutics, Inc.
 Spyre Therapeutics, Inc. Pharmaceuticals: MajorHealth Technology Operates as a clinical-stage biotechnology company | Health Technology |
Amherst College
 Amherst College Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Harvard Medical School
 Harvard Medical School Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Fairmount Funds Management LLC
Fairmount Funds Management LLC Investment ManagersFinance Provides investment advice | Finance |
Viridian Therapeutics, Inc.
 Viridian Therapeutics, Inc. Pharmaceuticals: MajorHealth Technology Operates as a biotechnology company that develops and manufactures monoclonal antibody products | Health Technology |
Viridian LLC
Viridian LLC BiotechnologyHealth Technology Operates as a biopharmaceutical incubator company | Health Technology |
RA Capital Management LP (Private Equity)
RA Capital Management LP (Private Equity) Investment ManagersFinance RA Capital invests in both public and private companies located in the United States. The firm targets companies operating in the fields of healthcare and life sciences. It provides financing for pre-seed, seed stage, early stage and growth capital requirements . The firm acts as a lead and co-investor, makes follow-on investments and has a board seat requirement. | Finance |
Aerovate Therapeutics, Inc.
 Aerovate Therapeutics, Inc. BiotechnologyHealth Technology Provides gene therapy services | Health Technology |
Viridian Therapeutics, Inc. /Old/
Viridian Therapeutics, Inc. /Old/ BiotechnologyHealth Technology Operates as a biotechnology company | Health Technology |
Apogee Therapeutics, Inc.
 Apogee Therapeutics, Inc. BiotechnologyHealth Technology Operates as a clinical stage biotechnology company that develops therapies for immunological and inflammatory disorders | Health Technology |
Dianthus Therapeutics, Inc.
 Dianthus Therapeutics, Inc. BiotechnologyHealth Technology Develops therapeutics for patients with autoimmune and inflammatory diseases | Health Technology |
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