Greg is on the Board of Simpson Grierson, head of Simpson Grierson's Resources and Infrastructure Department (covering the Commercial Property, Construction, and Local Government and Environment work groups) and a partner in the firm's Commercial Property Group. 

He advises on acquisitions and dispositions of companies, businesses and commercial property.  He also advises on all aspects of general commercial, consumer protection and company law.

Greg's property work includes providing legal opinions, drafting property-related agreements, sale and purchase agreements and leases, undertaking due diligences, and advising on dispute resolution.  In addition, Greg provides specialist advice on commercial leases and leasing projects relating to retail shopping centre developments.

Greg was the Chair of Lex Mundi for 2002-2003, and he remains actively involved in the organisation.  Lex Mundi is the world's leading association of independent law firms, with 160 members, 550 offices and 20,000 attorneys located in the major financial centres around the world.

• Invensys' (then BTR) acquisition of the Swichtec business (500 employees) for more than $130 million
• Hong Kong-based Great Eagle Holdings' acquisition of the Langham Hotel Auckland
• The negotiation and documentation of significant leasing projects for Westfield and other major commercial property owners and managers (ongoing)
• Wesfarmers' continued expansion of the Bunnings hardware megastores throughout New Zealand (ongoing)
• Abacus Property Group purchase of The Chateau on the Park Hotel in Christchurch

• Lex Mundi - Chair 2002-2003
• International Bar Association - Member
• New Zealand Property Institute - Member
• Cancer Society of New Zealand (Auckland division) - Honorary Solicitor
• New Zealand Coastguard Federation - Honorary Solicitor
• International Who's Who of Real Estate Lawyers 2000-2006 - Leading Lawyer
• Asia Pacific Legal 500 (2003/2004, 2004/2005, 2005/2006, 2006/2007 and 2007/2008) - Leading Individual
• AsiaLaw Leading Lawyers Guide - Leading Real Estate and Construction Lawyer (2006, 2007 and 2008)
• Legal Media Group's 2006 Guide to the World's Leading Real Estate Lawyers - Leading Real Estate Lawyer
• PLC Which Lawyer? Yearbook 2007 and 2008 - Highly recommended in Commercial Real Estate law