Officer and Director Biographies

Tianna Dumond, President

Ms. Dumond has been the Director of Internal Audit since 2013 at the Greater Orlando Aviation Authority (GOAA) that oversees the Orlando International Airport and Orlando Executive Airport.  She joined the GOAA in 2004 as an Auditor, and has more than 20 years of auditing experience.  Prior to joining the GOAA, she held various auditing positions with Orlando Health, Disney Worldwide Shared Services, PRG Schultz International, and the MONY Group.

Ms. Dumond attended the University of Central Florida in Orlando, where she earned a B.S. in Business Administration in Accounting.  She also is a Certified Internal Auditor, Certified Information Systems Auditor, Certified Government Auditing Professional, Certified Financial Services Auditor, Certified Fraud Examiner, and holds a Certificate in Risk Management Assurance.

She joined the AAIA in 2004 and was elected President in 2022.  She originally was elected in 2016 as Secretary, then appointed Vice President in 2019 when the position was vacated.  She Chairs both the Executive and Governance Committees, and is on the Conference Committee.  She was Chair of the Conference Committee in 2022, when Orlando International Airport hosted the 32nd Annual Conference.

She is the Past President of the Central Florida Chapter of the Institute of Internal Auditors and currently is on the Board, and is the Vice Chair of the Florida Audit Forum.  She also is a Board Member of the Central Florida Chapter of ISACA.  Ms. Dumond also volunteers as a Certified Florida Guardian ad Litem with Osceola County Court System, 9th Judicial Circuit. 

She enjoys cooking and being a mom.



Mike Gee, Vice President

Mr. Gee is Senior Internal Auditor for the Metropolitan Airports Commission (MAC) that owns and operates Minneapolis-St. Paul International Airport, as well as six general aviation airports within the Twin Cities metropolitan area.  Mr. Gee has worked in the internal audit profession for more than 16 years in various highly regulated industries including: retail; defense/aerospace; and, healthcare, where he has audited Sarbanes-Oxley, Medicare Part D, HIPAA, government contracting, and fraud risk management.

Mr. Gee attended the University of Wisconsin-La Crosse, where he earned a B.S. in Finance and Marketing.  He earned his M.B.A. from St. Cloud State University.  He is a Certified Fraud Examiner.

Mr. Gee joined the AAIA in 2014, and was elected Vice President in 2022 after serving as the Treasurer since 2018.  He is on the Executive, Conference, and Education Committees.  In addition, he was the Chair of the Conference Committee in 2019, when MAC hosted the 30th annual AAIA Conference.

He enjoys golfing, running, and all Minnesota sports teams.



Paula Murphy, Secretary

Ms. Murphy joined the Reno-Tahoe Airport Authority that oversees the Reno-Tahoe International Airport and Reno-Stead Airport in 2013 as an Internal Auditor.  Previously, she worked in banking as a Commercial Bank Examiner for the Federal Reserve Bank of San Francisco, as an Internal Auditor for a community bank in Truckee, California, and as a credit analyst for U.S. Bank.  While raising her two children, she had a contract loan underwriting business. 

Ms. Murphy graduated from the California State University, Chico, and earned a B.S. in Business Administration in Business Policy.  She also is a Certified Internal Auditor, Certified Government Auditing Professional, and Commissioned Commercial Bank Examiner.

In 2018, Ms. Murphy joined the AAIA Board, and has been a member since 2013.  In 2018, she was appointed the Assistant Treasurer.  In 2019, she joined the Board and became the Information Technology (IT) Coordinator where she participated in launching the current website platform and Chaired the IT Committee.  She currently Chairs the Communication Committee and is on the  Conference and IT Committees.

Volunteer work over the past several years includes being a girl scout leader, Treasurer for the KidZone Children's Museum, and Treasurer for a Parent Faculty Association.   She is currently a member of the Biggest Little Talkers Toastmasters Club, where she is the Vice President of Public Relations.

She enjoys spending time with her family, reading, and hanging out with friends.



Arturo Arispe, Treasurer

Mr. Arspe joined the San Antonio Airport System (SAAS) in 2012 and was promoted to Compliance Manager in 2017.  SAAS is owned and operated by the City of San Antonio and is home to two airports: San Antonio International Airport (SAT) and Stinson Municipal Airport (SSF), which is the second oldest continuing operating general aviation airport in the country.  Prior to joining the City of San Antonio organization, he worked for the Texas State Auditor's Office and has more than 15 years of auditing experience.

Mr. Arispe attended Concordia Lutheran University in Austin, Texas, where he earned a Bachelor's in Accounting.

In 2012, Mr. Arispe joined the AAIA and was elected Treasurer in 2022.  He is a current member of the Conference and Education Committees.

He enjoys boating, fishing, baseball, grilling, and traveling with his wife.



Laura Tatem, Past President

Ms. Tatem is the Director of Internal Audit for Hillsborough County Aviation Authority (HCCA) that oversees Tampa International Airport, Peter O. Knight Airport, Plant City Airport, and Tampa Executive Airport.  She has more than 15 years in auditing experience, and has been with HCCA since 2013.  Prior to joining HCCA, she worked as an external auditor primarily in the fields of government, non-profit, and construction.

She attended the University of North Carolina - Wilmington, where she earned a B.S. in Business Administration in Finance and Accounting, graduating Magna Cum Laude.  Ms. Tatem is a Certified Public Accountant, licensed in Florida and Virginia.  She is also a Certified Internal Auditor, Certified Government Auditing Professional, and holds a Certificate in Risk Management Assurance.  

Ms. Tatem joined the AAIA in 2013.  She was appointed President in 2019 when the position became vacated unexpectedly and elected into the position in 2020. She was originally elected as Treasurer in 2016 and then Vice President in 2018.  She Chairs the Nominating Committee, and is on the Executive, Steering, Governance, and Conference Committees.  She was Chair of the Conference Committee in 2021, when Tampa International Airport hosted the 31st Annual Conference.   She also serves on the Board for the Humane Society of Tampa Bay.

She enjoys water sports, spending time with her husband, and their menagerie of dogs, cats, and a turtle.



Alissa Bowles, Director

Ms. Bowles joined the Jacksonville Aviation Authority (JAA) in 2015 and is the Revenue Compliance Specialist.  The JAA oversees the Jacksonville International Airport, Herlong Recreational Airport, Cecil Airport, and Jacksonville Executive at Craig Airport. Prior to joining the JAA, she was the Manager of Audit and Compliance for the Jacksonville Port Authority and other previous experience included working with the Florida State College at Jacksonville as an Internal Control Specialist and at the New York Power Authority as an Auditor II.

Ms. Bowles earned her B.S. in Accounting from Bethune – Cookman University located in Daytona Beach, Florida and her M.B.A. from Jacksonville University.  She also is a Certified Internal Auditor and Certified Government Auditing Professional.

She became a member in 2018 and appointed to the Board in 2019 as a Director.  She was elected to the Board in 2021.  She is on the Membership, Education, and Governance Committees.

She enjoys traveling, attending music festivals and concerts, and spending time with her family and friends.




Omar Costa, Director

Mr. Costa was assigned to the Lee County Port Authority in July 2017 as the Senior Internal Auditor. The Authority oversees Southwest Florida International Airport and Page Field Airport.  Previously, he was with RSM as the auditor-in-charge.

Mr. Costa earned his B.S. in Accounting from Florida Gulf Coast University in 2010 in Fort Meyers.  He is a Certified Public Accountant.

He joined the AAIA in 2017 and was appointed to the Board in 2019.  He was elected to the Board in 2021.  He currently is on the Membership and Nominating Committees.  He was the past Chair of the Membership Committee.  He was the AAIA Auditor in 2018.

He enjoys spending time with his wife and kids, boating, and riding motorcycles.



Rhianna Hruska

Ms. Hruska joined the Denver International Airport (DEN) as a Senior Internal Auditor in 2021. Prior to working at DEN, she was an auditor for the City and County of Denver Auditor’s Office, Washington State Auditor’s Office, and Washington State Joint Legislative Audit and Review Committee. She has over five years of audit experience.

Ms. Hruska graduated from the University of California, Santa Cruz with a B.A. in Environmental Studies and Anthropology. She earned her Master of Environmental Studies and Master of Public Administration with a concentration in Public and Nonprofit Administration from The Evergreen State College in Olympia, Washington. She has a Teaching English as a Foreign Language certificate from the University of Toronto.

She became a member of the AAIA in 2021 and joined the Board in 2022. 

She enjoys reading, running, cooking, and traveling with her husband.



Samson Kimilu, Director

Mr. Kimilu is the General Manager of Risk Management and Internal Audit for the Kenya Airports Authority (KAA) that oversees all the airports in Kenya.  His responsibilities include providing assurance and consulting services on risk management, internal controls, and governance.  Prior to joining KAA, he worked with the Kenya Wildlife Service for nine years for the Internal Audit Department where he rose through the ranks to be the Chief Internal Auditor be fore he left to join KAA.

Mr. Kimilu is a Certified Public Accountant of Kenya and holds a BSc. Degree in Business Administration in Accounting.  He also holds a Masters degree in Business Administration in Strategic Management and Finance.  In addition, Mr. Kimilu is a graduate of the Advanced Management Program, Airport Executive Leadership Program and Airport Management Professional Accreditation Program.  He is accredited as an International Airport Professional.

He has been a member of the AAIA since 2009, and has presented at several conferences.  He was elected to the Board in 2022.  He is on the Membership and Conference Committees.

Mr. Kimilu loves conservation and served as an Honorary Game Warden with the Kenya Wildlife Service from 2008 through 2017.



Lesley M. Lightfoot, Director

Ms. Lightfoot is the Manager of Strategic Planning and Analysis for the Nassau Airport Development Company.  She has approximately 17 years of auditing and financial experience and has been with the Nassau International Airport since September 2018.  She has extensive knowledge in maintaining and reporting on enterprise risk management frameworks, developing audit programs, conducting audits, and performing risk assessment procedures. 

She attended Northwood University in West Palm Beach, Florida, where she earned a Bachelor‘s in Business Administration. She is a Certified Internal Auditor and is currently enrolled in the IIA's Certified Risk Management Assurance program.

She joined the AAIA in 2018 and was elected in 2021 to the Board.

Ms. Lightfoot is a member of the Institute of Internal Auditors, the Bahamas Institute of Financial Services Board, the ISACA Professional Association, the Risk Management Society, and, of course, the Association of Airport Internal Auditors. 



Marilou S. Parayaoan, Director

Ms. Parayaoan is an Audit Manager at the Metropolitan Washington Airports Authority‘s Office of Audit (MWAA).  MWAA operates the US capital‘s two airports:  Ronald Reagan Washington National and Washington Dulles International.  She has more than 15 years in auditing experience and has been with MWAA since 2010.  Prior to joining MWAA, she worked as an external and internal auditor primarily in the fields of government, non-profit, financial and manufacturing.

She attended the Polytechnic University of the Philippines - Manila, where she earned a Bachelor‘s in Accountancy.  Ms. Parayaoan is a Certified Public Accountant, licensed in California and Virginia.  She is also a Certified Internal Auditor, Certified Government Financial Manager, Certified Fraud Examiner, Certified Information Systems Auditor, Chartered Global Management Accountant and holds a Certificate in Airside Safety.

Ms. Parayaoan joined the AAIA in 2010.  She was appointed to the Board in 2021 and is completing an exited director's term.  She Chairs the Membership Committee.  She also serves on the Board of Governors for the IIA-DC Chapter and is on the Audit Committee and served a charity organization Medical Mission of Mercy as treasurer.

She enjoys gardening, cooking for her family and friends, spending time in the outdoors and traveling with her husband.




Janice Mirarchi, CPE Coordinator and Director

Ms. Mirarchi works for the City of Philadelphia that oversees the Philadelphia International Airport.  She has been the Contracts Audit Supervisor since 2012, and started with the airport in 2006.  Prior to working at the airport, Ms. Mirarchi worked for the City of Philadelphia as an Auditor for the City Controller's Office for 20 years.

Ms. Mirarchi graduated from La Salle University in Philadelphia, Pennsylvania, and earned a B.S. in Accounting.

Ms. Mirarchi joined the AAIA Board as CPE Coordinator in 2016, and has been a member of the AAIA since 2006.  She is on the Education, Conference, Nominating, and Membership Committees.  She was re-elected to the Board in 2021.

She loves reading, cooking, and shopping!



Callie Ullman, IT Coordinator and Director

Ms. Ullman is a Senior Auditor, in charge of construction audits, at the San Diego County Regional Airport Authority (SDCRAA) that operates the San Diego International Airport.  She has 26 years of audit experience in various industries, and has been with SDCRAA since 2010.  Prior to joining the Authority, she was the Audit Manager with RSM, LLP, US.

Ms. Ullman attended Southeast Missouri State University, earning a Bachelor of Science in Business Administration with a concentration in Accounting, and a Bachelor of Arts in Music.  She is a Californian licensed Certified Public Accountant, Certified Internal Auditor, and a Certified Construction Auditor.

Ms Ullman joined the AAIA in 2010.  She was elected in 2022 as the IT Coordinator.  She chairs both the IT and Education Committees.  She is also on the Conference Committee.  She was previously elected to the Board in 2019 but left in 2021 for personal reasons.

She enjoys eating, traveling the world, eating, hiking, eating, and running marathons and half marathons so she can justify all the eating.  Since she began running in 2011, Ms. Ullman has completed 154 half marathons and 21 full marathons, including 5 of the 6 Abbott World Major Marathons.