Keiichi Ono's LinkedIn profile reveals both this and his departure from the company.
Keiichi Ono's LinkedIn profile revealed Monolith Soft's involvement in The Legend of Zelda: Skyward Sword, as well as his departure from the company after almost 12 years.
Ono worked on many projects while at Monolith Soft, including Disaster: Day of Crisis and The Legend of Zelda: Skyward Sword. During Skyward Sword's development, Monolith Soft worked on field layout designs, conceptualizing sub-events, and writing some of the text. Exactly how much of the aforementioned tasks the team completed is not known.
Now that Ono has left the company, he has moved on to being the director at Nubee Tokyo. Nubee Tokyo is a development studio that works on social games.