Assists physician in cerebrospinal fluid (CSF) collection for clinical trials by educating patient / caregiver regarding the lumbar puncture procedure, preparing lumbar puncture supplies, providing supplies to physician during procedure while maintaining sterile field, aliquoting CSF by protocol-specified amounts into separate vials for storage and transport, instructing patient/caregiver in post-lumbar puncture care and expectations, conducting follow -up phone call to determine if any adverse events were experienced. Coordinates of all aspects of study visit activities for patients and families, including scheduling of hospital-based procedures such as MRI and PET, and other procedures to include clinical study visit interviews and assessments, ECG, lab draws, IV infusions, lumbar punctures, and dispensation of study medication.