[3][4] During his career Loch has produced recordings for some of the most recognisable names in jazz, including Yusef Lateef, Eddie Harris, Joe Pass, Tim Hagans, Terri Lyne Carrington, Dave Brubeck, Vijay Iyer, Vince Mendoza, George Gruntz, Esbjörn Svensson Trio and Manu Katché; many more released albums on his ACT Music label.

[11][12][13] By the late 1960s, Loch had become the managing director of the German arm of the newly formed Liberty Records/United Artists label in Munich, with special responsibility for the Blue Note Records catalogue.

[3] During this time Loch continued his production activities, including a touchstone recording of Gerry Mulligan, Paul Desmond and the Dave Brubeck Trio.

[15] Loch's time at WEA enabled him to work alongside seminal Atlantic Records jazz producer, Nesuhi Ertegun, who later appointed him president of WEA-Europe in London.

[6] His ascendancy within the recording industry was reflected in his commercial successes, which some attribute to his zeal for valuing the priorities of artists and listeners, described as a "balancing act between ethics and profitability".

[9]After some initial failures, Loch fulfilled his jazz dreams by successfully establishing ACT Music in 1992,[16] named after his commitment to encouraging signed artists to express themselves creatively.

[1] Jazzpaña assembled Spanish and US musicians with the Cologne-based WDR Big Band, performing arrangements by the then unknown American saxophonist Vince Mendoza.

[3] Loch has remarked that the Jazzpaña album set the blueprint for the ACT Music ethos, which entailed a 'European-flavoured jazz aesthetic' packaged distinctively.

[27] Loch has continued to develop an extensive catalogue for ACT Music and has projected the musical profiles of numerous European jazz artists, including Joachim Kühn, Michael Wollny, Nguyên Lê, Adam Bałdych, Marius Neset, Émile Parisien, and Lars Danielsson, as well as US artists such as Terri Lyne Carrington, Vijay Iyer, Rudresh Mahanthappa, and Scott DuBois.

[1] The Siggi & Sissi Loch Collection includes works by Yves Klein, Gerhard Richter, Georg Baselitz, Per Kirkeby and Sigmar Polke, among many others.