Our Team

Donna M. Hill
Accounting Director

Donna is OMG’s Accounting Director. She was Controller for an oil company for over 10 years where she oversaw all accounting functions to ensure proper recording of all transactions, 1099’s, collections, and much more. Prior to this she was Senior Accountant at a medical company.  Donna started her accounting career in 1990 and has a wealth of experience in all aspects of financial management, with skill proficiencies in financial management, quarterly reports, accounts payable/receivable, general ledgers, financial statements and bank reconciliations. Donna has an Associate of Science in Accounting, a Bachelor of Science in Accounting, and a Master of Science in Accounting/Controllership.

Nelly Cueva-Serna
Accounting Assistant

Nelly Cueva-Serna is OMG’s Accounts Payable Accountant.  Nelly has over 3 decades of accounting under her belt.  She brings with her a variety of experiences, working with attorneys, social workers, CPAs, restaurant owners, hotels, disaster recovery management, hospitals and her recent job was with a company that repairs Navy ship propellers. She recently completed a course in Medical Billing and Coding, which she thought was going to be her next career; however, she decided to join the OMG team and she loves the job and feels like part of the family.

Nelly likes relaxing and enjoying her free time with her family.  Her most joyful moments are spending time out on the beach with a good book and capturing a view of the pelicans.  She moved to Chesapeake two years ago from New Orleans, LA in search of the four seasons she has longed for all her life.

Kristian Quejado

Kristian brings over a decade of accounting experience focused in the high volume industry of medical billing. He spent the majority of his accounting career working for Guam’s largest medical imaging provider, supporting five medical facilities.  He worked his way up from Accounts Receivable Technician to Staff Accountant.   He is highly proficient in advanced bookkeeping and Excel and has an exceptional attention to detail in all aspects of accounting.

In his role of Accounting Assistant with OMG AFS, Kristian is responsible for the day to day management of our AP Automation system which we use to process payables for all OMG AFS clients. He uses his high standard of accuracy and attention to detail to ensure payables are processed without delay or error, making certain vendors receive prompt and accurate payments. He is excited to be fully cross trained in preparing financial statements and continuously works towards developing a successful accounting career. 

He graduated in 2019 from the University of Guam with a bachelor’s in business administration with a concentration in finance and economics.  

Kristian is a newlywed and recently moved stateside where he spends his free time exploring new places and creating new experiences with his wife and family. 

Organization Management Group was proud to be featured in Towne Today’s first issue of 2020.
Organization Management Group was proud to be featured in Towne Today’s first issue of 2020.


“NARPM has been working with OMG for over fifteen (15) years. During that time, NARPM’s revenue has grown over 200% and cash, reserves, and total assets have increased over 1000% each. OMG’s Accounting and Finance team ensures our data is secure, complete, and accurate. From investment oversight and monthly financial statement preparation to recommendations on cost savings measures, we value the professionals at OMG that manage our accounting and finance functions so we don’t have to.”

Kellie Tollifson

Kellie Tollifson, 2020 NARPM® President