After subsequent jobs, he worked in the Covent Garden Neal Street Restaurant of Antonio Carluccio under mentor Gennaro Contaldo, where at the same time the then-unknown chef Jamie Oliver was employed.

[2] Mälzer is a consultant to the editorial staff of the magazine Essen & Trinken für jeden Tag (en: Food & Drink for Everyday), of which he is also an advertising partner.

[7] During the COVID-19 pandemic in 2020, he organized a demonstration at the Hamburg city hall square to draw attention to the plight of the severely affected catering industry due to curfew restrictions.

Starting in December 2004 Mälzer also appeared frequently on the ZDF program Kochen bei Kerner, which was broadcast weekly on Friday evenings.

[9] After a break required for burnout syndrome,[10] Mälzer performed in front of an audience in 2007 in his stage show Ham’ se noch Hack.

Since February 2016 he has been on air in all but three episodes of the VOX cooking duel show Kitchen Impossible, which was awarded the German Television Prize in 2017 and 2018 in the category "Best Factual Entertainment".

[12][13] In October he starred in the documentary "Zum Schwarzwälder Hirsch" where he coached a team of persons with Down syndrome to open and run a restaurant.