- Dr. Sebnem ArslanPostdoctoral Research FellowLamont-Doherty Earth ObservatoryGeochemistry207 Comer61 Route 9W - PO B0x 1000PalisadesNY10964-8000USPhone:(845) 365-8609Fax:(845) 365-8155okten@ldeo.columbia.eduFields of interest:Helium Isotopes in GroundwaterHonors & Awards:Fulbright Fellowship

