'Bionic' Man to Climb 103 Flights: A man with a thought-controlled bionic leg is going to participate in Sunday's SkyRise Chicago event and climb 103 flights of stairs in the Willis Tower. Thiry-one-year-old Zac Vawter will prove that losing a limb can't stop a person from reaching lofty goals. The annual SkyRise event is organized to raise money for the Rehabilitation Institute of Chicago's Center for Bionic Medicine, which developed Vawter's leg. About 2,700 people are expected to participate alongside Vawter this Sunday. via DVICE