---
title: "John Johannes Jähnke"
description: "Startup Strategist & Online Marketing Consultant @ McGrinsey.com"
url: https://vutuv.de/john_johannes_j
username: "john_johannes_j"
avatar_url: https://vutuv.de/avatars/0159f976-5558-798a-b7e6-d88ccd7b9cdf/john_johannes_j-medium-32a470ac248b.avif
type: profile
schema_version: 3
generated_at: 2026-06-29T17:45:03Z
---

# John Johannes Jähnke

Startup Strategist & Marketing Consultant

Startup Strategist & Online Marketing Consultant @ McGrinsey.com

- Verified profile: yes
- Member since: 2017-02-01
- Followers: 1
- Following: 8
- Gender: Male

## Tags

- [Magic](https://vutuv.de/tags/magic) (2 endorsements)
- [Startup Strategy](https://vutuv.de/tags/startup_strategy) (2 endorsements)
- [Visionaire](https://vutuv.de/tags/visionaire) (2 endorsements)

## Experience

- Startup Strategist & Online Marketing Consultant @ McGrinsey.com (2000-01 – today)

## Links

- [McGrinsey.com](http://mcgrinsey.com)

## Contact

- Other: <multitaskforce@gmail.com>

## Social Media

- [LinkedIn](https://www.linkedin.com/in/johnjohnjohn)

## Addresses

- Berlin Base: Prinzenstraße 42, 10969, Berlin, Germany