THOMAS J. ZELLER

Corporate Board Profile

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BLACK HILLS CORP /SD/

Filing Date Source Excerpt
2016-03-17 Former Chief Executive Officer of RESPEC, a technical consulting and services firm with expertise in engineering, information technologies, and water and natural resources specializing in emerging environmental protection protocols.
2018-03-15 Retired. Former Chief Executive Officer of RESPEC, a technical consulting and services firm with expertise in engineering, information technologies, and water and natural resources.
2019-03-15 Former Chief Executive Officer of RESPEC, a technical consulting and services firm with expertise in engineering, information technologies, and water and natural resources specializing in emerging environmental protection protocols.

Source material: SEC submissions metadata and DEF 14A proxy filings from EDGAR. Last updated: 2026-03-22