GL Noble Denton appoints Dr Vicki Niesen to lead Hydraulic and Flow Assurance Consulting Services for Americas Brings more than 25 years of industry leadership in flow assurance to GL Noble Denton's American operations alongside senior colleague, Dr Trent Brown. Houston/Texas, 26 April 2011 - GL Noble Denton, the global independent technical advisor to the oil and gas industry, has appointed Dr Vicki Niesen to lead its Hydraulic and Flow Assurance Consulting Services department in the Americas.