[1] Prior to 2017, Segner was playing for SC 1880 Frankfurt, one of the most traditional clubs in Germany's domestic Rugby-Bundesliga competition.
[2] In 2017, Segner was on a six-month stay in New Zealand – after being offered a scholarship by Nelson College – when he was picked for the school's first XV team.
[3] He then went on to captain the Nelson College top side in 2018 and led them to their first UC Championship title in twelve years in 2019.
[5] At just 19 years of age, Segner was named in the Tasman Mako squad for the 2020 Mitre 10 Cup,[6] signing a two-year deal with the province.
Segner had a stand-out season during the 2021 Bunnings NPC as the Mako made the Premiership final before losing 23–20 to Waikato.