Engineer William Heffner Posted by Who's Who Site Administrator on April 4, 2018September 16, 2019 Most Recent Title: Engineer, Research Scientist Company: Scitonics Con. Industry: Engineer Years in Industry: 43 Years affiliated with Marquis Who’s Who: 14 Contact William Heffner: Name(required) Email(required) Website Comment(required) Submit Δ Share this:TwitterFacebookLinkedInLike this:Like Loading...