Shannon Oconnor American Lien: Workers Comp Specialists Shannon Oconnor and American Lien Inc. specialize in workers compensation cases in the state of California. The company acts as physician’s advocates, billing specialists, and work compensation law specialists. American Lien Inc. and Shannon Oconnor represent both applicant and defense counsel. Shannon Oconnor and American Lien Inc. have now joined forces with defense counsel to help establish better regulations and help to avoid frivolous claims.