# Dietmar Siemssen

> Dietmar Siemssen is a startup investor at Gerresheimer Glas. See 0 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Gerresheimer Glas](https://shizune.co/investors/profile/gerresheimer-glas)
- Last updated: Aug 2026

Dietmar Siemssen is a startup investor at Gerresheimer Glas. Dietmar Siemssen is the Founder & CEO of Gerresheimer Glas.

## About Gerresheimer Glas

VC Fund · Düsseldorf, Germany

Gerresheimer is a leading global partner to the pharma and healthcare industry. With our specialty glass and plastic products, we contribute to health and well-being. We have worldwide operations and about 10,000 employees manufacture our products in local markets, close to our customers. With our plants in Europe, North America, South America, andAsia, we generate revenues of approximately EUR 1.4 billion. The comprehensive product portfolio includes pharmaceutical packaging and products for the safe, simple administration of medicines: Insulin pens, inhalers, refillable syringes, injection vials, ampoules, bottles and containers for liquid and solid medicines with closure and safety systems as well as packaging for the cosmetics industry.

3 contacts available at Gerresheimer Glas.

| Name | Title | Profile |
| --- | --- | --- |
| Bernd Metzner | Chief Financial Officer | https://shizune.co/investors/profile/bernd-metzner-6c69 |
| Daniel Diezi | Vice President Digitalization & New Business Models | https://shizune.co/investors/profile/daniel-diezi |
| Dietmar Siemssen | Founder & CEO | https://shizune.co/investors/profile/dietmar-siemssen |

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