Based in Auckland, Doug Johnson is Tonkin + Taylor's Managing Director and an engineering geologist with more than 30 years’ experience.

Before becoming Managing Director in 2010, Doug managed the company's largest team - Geotechnical.

Doug holds an MSc (Hons) and has published several papers on risk assessment and the evaluation and design of quarry and mine slopes using quantitative risk methods.

Doug’s specialist skills include engineering geological mapping, site investigation, soil and rock assessment, slope stability, groundwater and natural hazard assessment. He worked on many large civil engineering, mining and quarry projects throughout New Zealand, the United Kingdom, Malaysia, Philippines, Indonesia and the South Pacific.