# Maria Lopez-Siegel Financial Associate ![Maria](/sites/g/files/omnuum7301/files/styles/hwp_4_5__320x400/public/smms/files/maria_e_lopez-siegel.jpg?itok=66sitgnr) smartphone [617 496 4044 ]() email [maria\_lopez-siegel@harvard.edu](mailto:maria_lopez-siegel@harvard.edu) Maria manages all the invoicing and accounting for the mass spectrometry facility. She can only answer your questions regarding billing for the facility. Please direct all other questions to Sunia Trauger or other staff working with you on your projects.