Rookie Carlos Munoz of Colombia finished second, Hunter-Reay finished third and Marco Andretti placed fourth.
Viso joins a lineup that includes defending IndyCar champion Ryan Hunter-Reay, and James Hinchcliffe and Mario Andretti.
Scott Dixon finished fourth and Helio Castroneves was fifth, putting him No. 1 in IndyCar points just ahead of Hunter-Reay.
"I thought I was turning some decent times at the time and he was still under my gearbox at every corner, " Hunter-Reay recalled.
Reay is an avid marathon runner, and said he joined the small company because he wanted to follow his passion for endurance sports.
Hunter-Reay took a turn with the lead as well from lap 23 to 43, but couldn't prevent Conway from getting inside of him on lap 44.
The British driver dominated the first of two races at the Detroit Grand Prix, finishing nearly 13 seconds ahead of defending series champion Ryan Hunter-Reay on Saturday.
Mason Reay was the vice president of global consumer marketing and merchandising for Dell before becoming the CEO of Nuun, a small Seattle-based company that makes electrolyte mix tablets for runners and cyclists.
Kellermann and University of Washington pathologist Donald Reay examined gunshot deaths in King County, Washington from 1978 to 1983, concluding that of 398 people killed in a home where a gun was kept, only two were shot when trying to get in.
FORBES: Why The Centers For Disease Control Should Not Receive Gun Research Funding
Julie Reay, Chairman of Kingston and Richmond Health Authority, said the leaflet gave details of and contact numbers for a wide range of services, including treatment centres and mental health services, and that contraception advice was just one small part of it.
Defending IndyCar champion Hunter-Reay, who was coming off a win at Barber two weeks ago, had too much speed as he passed Ana Beatriz and couldn't navigate his way through Turn 8, driving straight into the tire barrier to bring out a full-course yellow.
Probably best known for crashing on the final lap of last year's Indianapolis 500 while driving for Bobby Rahal, Sato also suffered disappointment two races earlier when he was headed to a podium finish at Long Beach and Ryan Hunter-Reay spun him on the final lap.
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