Dr Jim Collin
Dr Jim Collin founded The Collin Group in the USA over 25 years ago. He has served as a forensic expert on geotechnical failures including column supported embankments, aggregate columns, mechanically stabilized earth, soil nailing, earth retaining structures, building settlement, and reinforced soil slopes.
Ryan R. Berg
Ryan R. Berg was a pioneer in the use of geogrid soil reinforcements in retaining walls and steepened slopes throughout North America and is an internationally recognised expert in the design and construction of reinforced soil structures.
Mr Berg is a co-author of several seminal reference manuals on the design and construction of reinforced soil structures, including manuals for the U.S. Department of Transportation Federal Highway Administration (FHWA) and for the National Concrete Masonry Association.