Harald Walker, aka Sonic Walker, is a producer and remixer working across classic electro, trip-hop, house and techno. Active in electronic music underground for decades, his work spans DJing, VJing and productions released on Lux Nigra, Fresh Meat Records, Obliqu3, RZ Muzik and Brique Rouge. His tracks have found their way into DJ sets and radio shows across the scene.

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From 1995 to 2003 he ran one of Germany's earliest websites devoted to techno and electro music. From 2005 to 2012 he operated the Sonic Walker netlabel, releasing DJ mixes and promoting electronic music. After a break from music, he returned in 2025 and since then is focusing on producing and remixing.