Stephen Lemon MD Cools off For ALS Ice Bucket Challenge Omaha oncologist Stephen Lemon MD accepts the challenge and cools off for a good cause - the ALS #icebucket challenge. Amyotrophic lateral sclerosis (ALS) is more commonly known as Lou Gehrig's disease. The ALS Association leads the fight to treat and cure ALS through global research and nationwide awareness. Oncology Associates specializes in personalized cancer treatment at its two cancer care clinics in Omaha, as well as through its outreach clinics in Blair, Holdrege and Norfolk, NE. Visit to learn more about personalized cancer treatment.