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William Sheridan President & CEO

Senior Auctioneer/BROKER Sheridan Realty & Auction Co. Mason,MI. 48854

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William J. Milliken (CAI, BAS, AMM, GPPA) is Maine's only Benefit Auction Specialist and the founder of WJM Auctioneers in Portland, Maine. A licensed auctioneer in Maine and Massachusetts, licensed attorney, and former nonprofit executive, Bill provides comprehensive benefit auction strategy and live auction services to nonprofits across Maine and New England. He currently serves as President of the Maine Auctioneers Association. The BAS designation, awarded by the National Auctioneers Association, is held by fewer th...

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Bill has more than four decades in the auction industry. He became a licensed Washington auctioneer in 1984 and co-owned Medalia’s Auction Services in Seattle from 1992–1999. After working with LiveBid.Amazon.com (1999–2001), he co-founded BidSpotter in 2001 and helped grow it until its sale to ATG in 2010. Bill remained at ATG as Director of Implementation from 2010–2024. Since relocating to Texas in 2024 he holds licenses in Texas and Arkansas and works independently as a contractor covering all facets of the...

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Mission & Vision

The National Auction Association serves auction professionals by providing services built on four cornerstones: Advocacy, Community, Education, and Promotions.

Our vision is to be the unified voice of the auction profession, championing the interests of auctioneers everywhere.

Values Statement

We intentionally welcome all auction professionals. We do this without adherence to any social, religious, and/or political affiliation or creed.

We endeavor to foster a climate of purposeful inclusion, an environment where all can feel safe, valued, cared for, and given an opportunity to form meaningful connections with each other.

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