# Sebastian

**Entrepreneur · Berlin, Germany**

Building Things

Profile: https://path.cv/rumberg

*Last updated: August 2026*

---

## Experience

### Founder at Punching Giants
*Jan 2019 – Present*

Helping startups and tech companies gain attention through PR and content creation. Utilizing a combination of social media, content marketing, and organic growth tactics.

### Chairman Of The Board at Freie Waldorfschule Dessau
*Feb 2018 – Present*

Leading a non-profit team of over 200 parents and teachers building a modern school for 300 children. Managing the development of a 10k sqm schoolyard into a learning environment.

### Interim Communications Lead DACH at XAnge
*Jun 2022 – Jul 2023*

Managed communication and research for a leading early-stage European venture fund.

### Interim PR & Communications Lead at Zenjob
*Dec 2021 – Jul 2022*

Led communications and PR in Germany, Netherlands, and the UK for a platform economy company. Focused on increasing visibility and managing stakeholder relations.

### Marketing & PR at LivingPackets
*Oct 2019 – Feb 2022*

Managed marketing and PR for a sustainable packaging startup. Focused on promoting smart, environmentally friendly e-commerce solutions.

### Mentor at Google
*Jan 2017 – Jan 2020*

Mentored ambitious founders and teams at Google Launchpad. Provided guidance on business strategy and growth.

### Vice President Communications at KODAKOne
*Jun 2018 – Oct 2018*

Led communications strategy for a global rights management platform.

### Account Director at Ballou PR
*Jul 2015 – Jun 2018*

Managed PR accounts and communications strategies for various tech clients. Led teams and executed national and international campaigns.

### Head of PR at HitFox Group
*Jan 2014 – Jan 2015*

Built and led a core PR team while creating a global PR and brand communications strategy. Advised and supported existing startups within the incubator.

### Co-Founder at Startup Germany e.V.
*Jan 2013 – Jan 2015*

Co-founded a non-profit organization to inspire, support, and promote entrepreneurs in Germany. Connected startups with SMEs and the broader economy.

---

## Skills

Strategic Communications · Public Relations · Content Marketing · Social Media Marketing · Growth Hacking · Journalism · Ghostwriting · Team Leadership

---

## Education

### Bachelor of Arts in Kommunikation, Journalismus
*Universität Leipzig*
Jan 2006 – Jan 2011

### Certificate in Science communication et science politique
*Université Lumière Lyon 2*
Jan 2008 – Jan 2009

---

## Links

- **LinkedIn**: https://www.linkedin.com/in/rumberg