"It’s a great privilege," he said. "I hope I will be able to bring my experience to bear."
"It's no secret that I have been taking my qualifications and I see this as the first step in my future career.
"I'm really looking forward to working alongside David and the team."
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Colo became a mother of three, grandmother of 16, great-grandmother of 12 and great-great-grandmother of three.
The district's director of homeland security has said officials are planning for 800,000 to 900,000 people to attend the ceremony.
The Supreme Court is set to decide on whether disabled travellers are legally entitled to have priority use of wheelchair spaces on buses.