Try Sherri Holstad at email@example.com for the HR contact. My advice is don't get your hopes up high -- and make sure you protect yourself.
I was really frustrated by their hiring process. I waited two months between my first and second interviews. Their HR contact, Ruchi Nandar, kept sending me these teaser emails asking me if I was still interested in the opening I was interviewing for. This company supposedly installed an SAP system in 9 months. Most SAP implementations require 2-3 years. Yet it took three months for them to decid on a simple administrative position. It seems they have their priorities backwards. There's also the issue that their former CEO/CFO -- I think his last name is Dooley -- is facing a 10+ year prison sentence for financial misconduct in 2003.
The only reason ESI has a business is because Samsung and Hynix, their two largest customers, don't want to waste their time building their own UV lasers, yet both could.