He is deputy chairman of Far North electricity lines company Top Energy, which was named New Zealand 2012 Lines Company of the Year in August; and a trustee of the Northland Youth Development Trust and of training sailing ship R Tucker Thompson. The vessel runs courses to develop confidence, teamwork, new skills and leadership in young people.
The Youth Development Trust has three on-going projects: the Lion Foundation Young Enterprise Scheme (YES), where students learn about real-world business by forming their own companies, create a new product or service, fund start-up capital, start production and market the idea; the Young Entrepreneur Programme, which provides former YES students with the support to continue with their business idea; and the Northland Student Forum.
The forum brings together senior secondary students from across the region as a collective student voice for Northland, giving them the chance of having input into decision-making and policy development at both regional and national levels.
The trust has also co-ordinated a number of one-off projects during the years, such as the Northland Enterprising Teachers Conference, The Great Education Property Auckland, and the E4E (education for enterprise) Awards.
Simm is also a committee member for the Northland branch of the New Zealand Institute of Directors, which works to encourage the appointment of Northlanders to boards rather than people brought in from outside the region, and to improve the standard of governance skills in New Zealand business.