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diff --git a/grpc/include/grpc/event_engine/internal/memory_allocator_impl.h b/grpc/include/grpc/event_engine/internal/memory_allocator_impl.h
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+++ b/grpc/include/grpc/event_engine/internal/memory_allocator_impl.h
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+// Copyright 2021 The gRPC Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#ifndef GRPC_EVENT_ENGINE_INTERNAL_MEMORY_ALLOCATOR_IMPL_H
+#define GRPC_EVENT_ENGINE_INTERNAL_MEMORY_ALLOCATOR_IMPL_H
+
+#include <grpc/impl/codegen/port_platform.h>
+
+#include <algorithm>
+#include <memory>
+#include <type_traits>
+#include <vector>
+
+#include <grpc/event_engine/memory_request.h>
+#include <grpc/slice.h>
+
+namespace grpc_event_engine {
+namespace experimental {
+
+namespace internal {
+
+/// Underlying memory allocation interface.
+/// This is an internal interface, not intended to be used by users.
+/// Its interface is subject to change at any time.
+class MemoryAllocatorImpl
+    : public std::enable_shared_from_this<MemoryAllocatorImpl> {
+ public:
+  MemoryAllocatorImpl() {}
+  virtual ~MemoryAllocatorImpl() {}
+
+  MemoryAllocatorImpl(const MemoryAllocatorImpl&) = delete;
+  MemoryAllocatorImpl& operator=(const MemoryAllocatorImpl&) = delete;
+
+  /// Reserve bytes from the quota.
+  /// If we enter overcommit, reclamation will begin concurrently.
+  /// Returns the number of bytes reserved.
+  /// If MemoryRequest is invalid, this function will abort.
+  /// If MemoryRequest is valid, this function is infallible, and will always
+  /// succeed at reserving the some number of bytes between request.min() and
+  /// request.max() inclusively.
+  virtual size_t Reserve(MemoryRequest request) = 0;
+
+  /// Release some bytes that were previously reserved.
+  /// If more bytes are released than were reserved, we will have undefined
+  /// behavior.
+  virtual void Release(size_t n) = 0;
+
+  /// Shutdown this allocator.
+  /// Further usage of Reserve() is undefined behavior.
+  virtual void Shutdown() = 0;
+};
+
+}  // namespace internal
+
+}  // namespace experimental
+}  // namespace grpc_event_engine
+
+#endif  // GRPC_EVENT_ENGINE_INTERNAL_MEMORY_ALLOCATOR_IMPL_H