One Inc Chief Executive Officer Ian Drysdale has more than 25 years of senior leadership experience with leading payments technology providers including First Data, WorldPay, and Elavon. Most recently he led Zelis Payments, the payments division of B2B healthcare technology provider Zelis Healthcare, and was also Executive in Residence for private equity firm Great Hill Partners, helping to identify and pursue investment opportunities in the financial technology sector and advising existing portfolio companies.