You can email me at lowe [at] hertie-school [dot] org.
If you know my mobile number, try that before any kind of office phone. If it’s sensitive, I’m also on Signal.
In case you want to send me things, here’s a work address:Hertie School of Governance
If you’re a pedestrian, here’s a map.
If you’re a cruise missile, you might prefer N 52° 30′ 46.1231″ E 13° 23′ 18.8719″ Elevation: 170′.